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Our Library uses the Library of Congress Classification System to assign call numbers. In this system, the first two or three lines of a call number identify the subject of a book or other item. The main call number used for Microbiology is QR.
QR100-130 Microbial ecology
QR171 Microorganisms in the animal body
See also the Internet guides listed under General Biology (see link below), many of which includes sections on microbiology.