Author: Ralph Helfer
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Genre
- Animals
- Architecture
- Art
- Biography
- Business
- Cinema
- Cookbooks
- Culture
- Design
- Drawing
- Economics
- Encyclopedia and Dictionary
- Family and Friendship
- Fitness
- Gambling
- Games
- Hardware
- Healthcare
- History
- Hobbies
- Information Technologies
- Languages
- Martial Arts
- Medicine
- Military
- Music
- Novels
- Other
- Personality
- Photo
- Poetry
- Politics and Sociology
- Programming
- Relationships
- Religion
- Science
- Astronomy
- Biology
- Chemistry
- Cryptography
- Engineering and Technology
- Mathematics
- Philosophy
- Physics
- Psychology
- Security
- Sexuality
- Software
- Sport
- Travel
- Web Development