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     Bradley's library uses the Library of Congress classification system.  All natural sciences are in the Q's.  
Q1-295 General Science
QD - Chemistry
1-65........................General
71-142....................Analytical chemistry
146-197.....................Inorganic chemistry
241-441.....................Organic chemistry
QH - Natural History and Biology
1-199.5......................General (incl. conservation)
201-278.5..................Microscopy
301.705.....................Biology
359-425.....................Evolution
426-470.....................Genetics
540-559.....................Ecology
573-671.....................Cytology
QK - Botany
1-474.5......................General
474.8-495..................Spermatophyta
504-638.....................Cryptograms
640-707.....................Plant anatomy
710-899.....................Plant physiology
900-989.....................Plant ecology
QL - Zoology 
1-355........................General
362-599-82................Invertebrates
605-739.3..................Vertebrates
750-795.....................Animal behavior
799...........................Morphology
801-950.9..................Anatomy
951-991.....................Embryology
QM - Human Anatomy
QP - Physiology
QR - Microbiology
1-74..........................General
75-99.5......................Bacteria
180-189.5..................Immunology
355-502.....................Virology
Related fields not in the Q's
GE - Environmental Science
S - Agriculture
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