Helfer, Mark Mathew Author
Biography not available.
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FAMILY & RELATIONSHIPS
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FICTION
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Christian
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Indigenous
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📚
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GARDENING
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GARDENS
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GRAPHIC NOVELS
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Hamilton
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HEALTH & FITNESS
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📚
HISTORY
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Europe
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HOUSE & HOME
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- Safety & Security (see also headings under SE
- Small Spaces
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HUMOUR
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JUVENILE FICTION
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Animals
- Alligators & Crocodiles
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- Baby Animals
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- Butterflies, Moths & Caterpilla
- Cows
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- Dinosaurs & Prehistoric Crea
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- Dogs
- Ducks, Geese, etc.
- Elephants
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- Giraffes
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- Insects & Spiders
- Insects, Spiders, etc.
- Jungle Animals
- Kangaroos
- Lions, Tigers, Leopards, etc.
- Mammals
- Marine Life
- Mice, Hamsters, Guinea Pigs,
- Mice, Hamsters, Guinea Pigs, et
- Mythical Creatures
- Nocturnal
- Penguins
- Pets
- Pigs
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- Reptiles & Amphibians
- Rescue
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- Worms
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- Bedtime & Dreams
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- Boys & Men
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- Classics
- Clothing, Dress & Hair
-
Comics & Graphic Novels
- Action & Adv
- Action & Advent
- African Amer
- Biography
- Biography &
- Classic Adap
- Classic Adaptat
- Coming of Ag
- Contemporary Women
- Diversity &
- East Asian Style
- European Style (incl. Bandes Dessi
- Fairy Tales,
- Fairy Tales, Fo
- Fairy Tales, Folk Tales, Legends &
- Historical Fiction
- Indigenous P
- Indigenous Peop
- Light Novel
- Manga
- Mystery & De
- Mystery & Detec
- Nonfiction
- Reference, Guides & Companions
- Science & Na
- Science Fict
- Slice of Life
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- Concepts
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Holidays & Celebrations
- Birthdays
- Christmas &
- Christmas & Adv
- Day of the D
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- General (see
- General (see al
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- Other, Non-R
- Other, Non-Reli
- Other, Relig
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- Passover
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- Humorous Stories
- Imagination & Play
- Indigenous Peoples of Turtle Island
- Interactive Adventures
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- Lifestyles
- Light Novel (Ranobe)
- Love & Romance
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- Museums
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- Neurodiversity
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- Poetry (see also Stories in Verse)
- Politics & Government
- Readers
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- Robots
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- School & Education
-
Science & Nature
- Anatomy & Physio
- Anatomy & Physiolog
- Biology
- Chemistry
- Disasters
- Discoveries
- Environment
- Environmental Co
- Environmental Conse
- Environmental Sc
- Environmental Scien
- Experiments & Pr
- Experiments & Proje
- Flowers & Plants
- General (see als
- General (see also h
- History of Scien
- History of Science
- Trees & Forests
- Weather
- Short Stories
- Steampunk
- Stories in Verse (see also Poetry)
- Technology
- Thrillers & Suspense
- Toys, Dolls & Puppets
- Transportation
- Trickster Tales
- Werewolves & Shifters
- Westerns
- Zombies
📚
JUVENILE NONFICTION
- Adventure & Adventurers
- Biracial & Multiracial
- Building & Construction
- Community & Neighbors
- Curiosities & Wonders
- Drama
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Health & Daily Living
- Beauty & Gr
- Daily Activiti
- Daily Activities
- Diet & Nutr
- Diet & Nutriti
- Diseases, I
- Diseases, Illn
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- Drugs, Alcohol
- First Aid
- Fitness & E
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- Mental Heal
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- Mindfulness &
- Mindfulness & Med
- Personal Hygie
- Physical Im
- Physical Impai
- Puberty
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- Sexuality &
- Sexuality & Pr
- Toilet Trainin
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- Inspirational & Personal Growth
- Literary Criticism & Collections
- Paranormal & Supernatural
- Places
- Social Topics
- Spies & Spying
-
Study Aids
- ACT
- Advanced Placement
- Armed Forces (incl. ASVAB)
- Bar Exam
- Book Notes (see also JUVENILE NONFICTION
- Book Notes (see also S
- Book Notes (see also STUD
- Citizenship
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- CLEP (College-Level Examination Program)
- College Entrance
- College Guides
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- English Proficiency (incl. TOEFL & IELTS)
- Financial Aid
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- NCLEX
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- Regents
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- Study Guides
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- Test Preparation
- Tests (Other)
- USMLE (United States Medical Licensure Examinat
- Vocational
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📚
KINDRED
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LANGUAGE ARTS & DISCIPLINES
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📚
LANGUAGE STUDY
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- Ancient Languages (see also Latin)
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📚
LAW
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LITERARY CRITICISM
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Subjects & Themes
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- Religious & Inspi
- Romance & Erotica
- Science Fiction & Fantasy
- Sports (see al
- Still Life
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- Tobacco-Relate
- Trains
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LITERARY STUDIES
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LONDON
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Lozada
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MATHEMATICS
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MEDICAL
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Nursing
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Medical : Nursing - Mental Health
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MIND
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MIND, BODY, SPIRIT
- Afterlife & Reincarnation
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MUSEOLOGY
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MUSIC
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NATURE
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NON-CLASSIFIABLE
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NONLINEAR SCIENCE
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Ormonde
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PERFORMING ARTS
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- Business Aspects
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PHILOSOPHY
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POLITICAL SCIENCE
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POPULAR SCIENCE
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PSYCHOLOGY
- Animal & Comparative Psychology
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- Hypnotism
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Psychotherapy
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- Counseling
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- Existential
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- Social Psychology
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RELIGION
- African Diaspora Religion, Spirituality & Theolog
- Agnosticism
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Christianity
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- Sacred Places
- Scientology
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- Sexuality & Gender Studies
- Shintoism
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- Spirituality
- Taoism (see also PHILOSOPHY
- Theism
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- Theosophy
- Unitarian Universalism
- Wicca (see also MIND, BODY, SPIRIT
- Zoroastrianism
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RELIGIOUS STUDIES
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SCIENCE
- Acoustics & Sound
- Applied Sciences
- Bioinformatics
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- Chaotic Behavior in Systems
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- Electron Microscopes & Microscopy
- Environmental Science (see also Chemistry
- Experiments & Projects
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Life Sciences
- Anatomy & Physiology (see also Lif
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Physics
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📚
SELF-HELP
- Adult Children of Substance Abusers
- Affirmations
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- Emotions
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- Personal Growth
- Post-Traumatic Stress Disorder (PTSD)
- Safety & Security
- Self-Hypnosis
- Self-Management
- Sexual Instruction
- Spiritual
- Substance Abuse & Addictions
- Twelve-Step Programs
📚
SOCIAL SCIENCE
- Abortion & Birth Control
- Agriculture & Food (see also POLITICAL SCIE
- Anthropology
- Archaeology
- Biracial & Multiracial Studies
- Black Studies (Global)
- Body Image & Fat Studies
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- Border Studies
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- Death & Dying
- Decolonization
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- Disability
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- Discrimination (incl. Prejudice, Racism, Co
- Disease & Health Issues
- Diversity & Multiculturalism
- Enslavement
- Feminism & Feminist Theory
- Folklore & Mytholo
- Folklore & Mythology
- Freemasonry & Secret Societies
- Future Studies
- Gender Studies
- Gerontology
- Holidays (non-religious)
- Human Geography
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- Human Sexuality (see also PSYCHOLOGY
- Human Trafficking
- Immigration & Emigration
- Indigenous Peoples of Turtle Island Studies
- Indigenous Studies
- Intersectionality
- Islamic Studies
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- Media Studies
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- Privacy & Surveillance (see also POLITICAL
- Prostitution & Sex Trade
- Race & Ethnic Relations
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- Research
- Sexual Abuse & Harassment
- Social Classes & Economic Disparity
- Social Work
- Sociology
- Sociology of Religion
- Statistics
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- Violence in Society
- Volunteer Work
- Women's Studies
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SPIRIT
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SPORT
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SPORTS & RECREATION
- Air Sports
- Animal Sports
- Archery
- Baseball
- Baseball & So
- Baseball & Softb
- Baseball & Softball
- Basketball
- Bodybuilding & Weightlifting
- Bowling
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- Caving
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- Cultural & Social Aspects
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- Fencing
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- Football
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- Martial Arts
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- Olympics & Pa
- Olympics & Paral
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- Outdoor Skills
- Pool, Billiards, Snooker
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- Rugby
- Running & Jogging
- Shooting
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- Soccer
- Softball
- Sports Psychology
- Track & Field
- Training
- Triathlon
- Volleyball
- Walking
- Water Sports
- Winter Sports
- Women in Sports
- Wrestling
📚
TECHNOLOGY & ENGINEERING
- 3D Printing
- Aeronautics & Astronautics
- Agriculture
- Automation
- Biomedical
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- Chemical & Biochemical
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- Control Theory
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- Electrical
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- Emergency Management
- Engineering (General)
- Environmental
- Fiber Optics
- Fire Science
- Fisheries & Aquaculture
- Food Science
- Fracture Mechanics
- Holography
- Hydraulics
- Imaging Systems
- Indigenous Knowledge & Perspectiv
- Industrial Design
- Industrial Engineering
- Industrial Health & Safety
- Industrial Technology
- Lasers & Photonics
- Machinery
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- Materials Science
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- Mechanical
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- Military Science
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- Nanotechnology & MEMS
- Optics
- Pest Control
- Petroleum
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- Quality Control
- Radar
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- Remote Sensing & Geographic Infor
- Robotics
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- Signals & Signal Processing
- Social Aspects
- Structural
- Superconductors & Superconductivi
- Surveying
- Systems Engineering
- Technical & Manufacturing Industr
- Technical Writing
- Telecommunications
- Television & Video
- Textiles & Polymers
- Tribology
- Welding
📚
TRAVEL
📚
TRAVEL WRITING
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TRUE CRIME
- Abductions, Kidnappings & Missing Persons
- Cold Cases
- Con Artists, Hoaxes & Deceptions
- Cybercrime
- Domestic Violence & Abuse
- Drug Trafficking
- Espionage
- Heists & Robberies
- Human Trafficking & Enslavement
- Murder
- Organized Crime
- Sexual Assault
- White Collar Crime
- Wrongful Conviction & Miscarriage of Justice
📚
YOUNG ADULT FICTION
- Biographical
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- Clean & Nonviolent
- Computers & Digital Media
- Fashion & Beauty
- Hi-Lo Readers
- Law & Crime
- Loners & Outcasts
- Mysteries & Detective Stories
- Novels in Verse
- Own Voices
- Paranormal, Occult & Supernatural
- Short Stories, Collections & Anthologi
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Social Themes
- Activism & Social Just
- Activism & Social Justice
- Adolescence & Coming of A
- Assimilation
- Bullying
- Class Differences
- Competition & Rivalry
- Cutting & Self-Harm
- Dating & Relationships
- Dating & Sex
- Death, Grief, Bereavem
- Death, Grief, Bereavement
- Depression & Mental Illne
- Drugs, Alcohol, Substa
- Drugs, Alcohol, Substance
- Eating Disorders & Bod
- Emigration, Immigratio
- Emigration, Immigration &
- Emotions & Feelings
- Friendship
- General (see also head
- General (see also heading
- Kindness
- Manners & Etiquette
- Mental Illness
- New Experience
- Peer Pressure
- Personal Identity
- Physical & Emotional A
- Physical & Emotional Abus
- Pregnancy
- Prejudice & Racism
- Prejudice, Racism & Color
- Religion & Faith
- Runaways
- Self-Esteem & Self-Rel
- Self-Esteem & Self-Relian
- Sexual Abuse
- Strangers
- Values & Virtues
- Violence
- Superheroes
- Travel & Transportation
- Virtual Worlds