Psychology 67

Philosophy 57

Sociology 48

History 30

Science 27

Family & Relationships 23

Self Help 20

Medical 20

Nature 18

Business 11

Pets 10

Sports & Recreations 10

Cooking & Food 9

Travel 9

Christian Nonfiction 8

Young Adult Nonfiction 7

Politics 6

Home Design & Décor 5

Women's Studies 5

Art 4

Military 4

Juvenile Nonfiction 3

Literary Criticism 3

Performing Arts 3

Humor (Nonfiction) 2

Crafts 2

Gardening 2

Photography 2

Reference 2

African American Nonfiction 1

Computer Technology 1

Current Events 1

Education 1

Essays 1

Finance 1

Games 1

LGBTQIA+ (Nonfiction) 1

Writing 1

Language Arts 1

Architecture 1

Music 1

Research 1

True Crime 1