A - General Works 7,270
B - Philosophy, Psychology, Religion 104,024
C - Historical Sciences 6,011
D - World History 67,334
E - United States History 185,882
F - General American History 15,832
G - Geography, Anthropology, Recreation 18,792
H - Social Science 111,495
J - Political Science 26,632
K - Law 20,211
L - Education 22,582
M - Music 92,852
N - Fine Arts 64,678
P - Language and Literature 167,189
Q - Science 62,634
R - Medicine 32,914
S - Agriculture 8,793
T - Technology 31,071
U - Military Science 4,866
V - Naval Science 1,639
Z - Library Science 5,581
DS - Asia 16,029
D - General History 12,685
DA - Great Britain 9,158
DT - Africa 4,253
DC - France, Andorra, Monaco 3,930
DK - Russia, Soviet Union, Former Soviet Republics, Poland 3,560
DG - Italy, Malta 3,511
DD - Germany 2,555
DF - Greece 1,971
DP - Spain, Portugal 1,358
DR - Balkan Peninsula 1,125
DU - Oceania (South Seas) 1,003
DB - Austria, Liechtenstein, Hungary, Czechoslovakia 692
DE - Grecco-Roman World 375
DL - Northern Europe, Scandinavia 321
DH - Low Countries 205
DJK - Eastern Europe (General) 198
DJ - Netherlands (Holland) 148
DX - Gypsies 84
DQ - Switzerland 81
DAW - Central Europe 35