Basement Ground 1st 2nd 3rd Map

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Library of Congress Classification 

A B C D E F G H J K L M N P Q R S T U W Z 

Subclass G Geography (General), Atlases, Globes, Maps
Subclass GA Mathematical geography, Cartography
Subclass GB Physical geography
Subclass GC Oceanography
Subclass GE Environmental sciences
Subclass GF Human ecology, Anthropogeography

Subclass GN Anthropology
Subclass GR Folklore
Subclass GT Manners and customs (General)
Subclass GV Recreation, Leisure