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A call number is like a book's address; it tells you where to find a book in the library's collection. Call numbers are arranged alphabetically, and then by whole number (everything before the first period in the call number).
The following call number ranges are where you'll find most of our books on Biology. The Library of Congress Classification Outline provides a full guide to call numbers.
Subclass QH 1-278.5 - Natural History (general)
Subclass QH 359-425 - Evolution
Subclass QH426-470 - Genetics
Subclass QH 540-549.5 - Ecology
Subclass QH 573-671 - Cytology
Subclass QK - Botany
Subclass QL - Zoology
Subclass QM - Human Anatomy
Subclass QP - Physiology
Subclass QR - Microbiology