900
900 Geography & history
901
901 Philosophy & theory
902
902 Miscellany
903
903 Dictionaries & encyclopedias
904
904 Collected accounts of events
905
905 Serial publications
906
906 Organizations & management
907
907 Education, research, related topics
908
908 With respect to kinds of persons
909
909 World history
910
910 Geography & travel
911
911 Historical geography
912
912 Graphic representations of earth
913
913 Ancient world
914
914 Europe
915
915 Asia
916
916 Africa
917
917 North America
918
918 South America
919
919 Other areas
920
920 Biography, genealogy, insignia
921
921 Not assigned or no longer used
922
922 Not assigned or no longer used
923
923 Not assigned or no longer used