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.
GB Physical Geography
651-2998 Hydrology, water
906 Watersheds
GV Recreation
193-200.5 Outdoor recreation
HD Land, agriculture, industry
101-1395 Land (including real estate and land tenure)
216-243 Public lands (including grazing)
1405-2206 Agriculture (including agricultural economics, water rights)
1635-1641 Pasture lands
QH Natural history; general biology
540-549 General ecology
QK Botany
75-77 Herbariums
91-97 Classification
100 Poisonous plants
101-474.5 Phytogeography (including floras)
475-497 Spermatophyta
641-673 Plant anatomy
710-899 Plant physiology
901-938 Plant ecology
QL Zoology
81.5-84.77 Wildlife conservation
101-345 Geographical distribution
351-355 Classification and nomenclature
671-699 Birds
700-739.2 Mammals
750-991 Animal behavior, morphology, anatomy, and embryology
S General Agriculture
560-575 Farm management, farm economics
591-599 Soils
622-627 Soil conservation
631-667 Fertilizers and soil improvement
671-760 Farm machinery and engineering
900-972 Conservation of natural resources
SB Plant culture
114-117 Seeds
119-124 Propagation (including breeding)
193-207 Forage crops (including ranges and range watershed, pastures, harvested roughage)
481-485 Parks and public reservations
611-615 Weeds
617-618 Poisonous plants
621-795 Plant pathology
993-999 Noxious and useful animals
SD Forestry
411-425 Conservation and protection
426-428 Forest reserves (including grazing)
SF Animal culture
85 Range Management
95-99 Feeds and feeding, animal nutrition
105-109 Breeds and breeding
191-219 Beef cattle
277-318 Horses
371-379 Sheep, wool
381-395 Goats
399-401 Semidomesticated (including deer, muskox, reindeer)
SH Fisheries and fish culture
171-199 Fish diseases, pests and environmental pollutants
200-324 Fisheries in particular waters
325-329 Fishery management and conservation - general
330-345 Fishery technology and commercial fishery methods
346-364 Fishery management and conservation - individual species
SK Hunting
295-305 Big game hunting
311-335 Bird hunting
351-579 Wildlife management, game protection
601-605 Dude ranching
TD Environmental engineering
420-427 Water pollution