Reference Desk

• 000-099 Generalities
• 100-199 Philosophy & Psychology
• 200-299 Religion
• 300-399 Social Sciences
• 400-499 Languages
• 500-599 Natural Science & Mathematics
• 600-699 Technology & Applied Science
• 700-799 The Arts
• 800-899 Literature & Rhetoric
• 900-999 Geography & History
• Billerica
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"Mathematics, rightly viewed, possesses not only truth, but supreme beauty-a beauty cold and austere, like that of sculpture, without appeal to any part of our weaker nature, without the gorgeous trappings of painting or music, yet sublimely pure, and capable of a stern perfection such as only the greatest art can show.."
- Bertrand Russell (1872-1970)

500-599 Natural Sciences & Mathematics

• 500 Natural Sciences & Mathematics
• 510 Mathematics
• 520 Astronomy & Allied Sciences
• 530 Physics
• 530.81 - Unit Converter
• 540 Chemistry & Allied Sciences
• 546.8 - Web Elements Periodic Table
• 550 Earth Sciences
• 551.5 - Intellicast Weather Service
• 560 Paleontology / Paleozoology
• 570 Life Sciences / Biology
• 574.5 - Biomes & Ecosystems
• 580 Plants
• 580 - Plants Database
• 590 Animals