A - General Works 6,973
B - Philosophy, Psychology, Religion 102,917
C - Historical Sciences 5,956
D - World History 66,858
E - United States History 185,195
F - General American History 15,709
G - Geography, Anthropology, Recreation 18,629
H - Social Science 110,594
J - Political Science 26,404
K - Law 20,067
L - Education 22,338
M - Music 92,417
N - Fine Arts 63,869
P - Language and Literature 165,506
Q - Science 62,235
R - Medicine 32,834
S - Agriculture 8,617
T - Technology 30,833
U - Military Science 4,847
V - Naval Science 1,645
Z - Library Science 5,493
DS - Asia 15,935
D - General History 12,551
DA - Great Britain 9,121
DT - Africa 4,215
DC - France, Andorra, Monaco 3,914
DK - Russia, Soviet Union, Former Soviet Republics, Poland 3,500
DG - Italy, Malta 3,497
DD - Germany 2,548
DF - Greece 1,962
DP - Spain, Portugal 1,350
DR - Balkan Peninsula 1,116
DU - Oceania (South Seas) 999
DB - Austria, Liechtenstein, Hungary, Czechoslovakia 687
DE - Grecco-Roman World 368
DL - Northern Europe, Scandinavia 321
DH - Low Countries 205
DJK - Eastern Europe (General) 195
DJ - Netherlands (Holland) 148
DX - Gypsies 83
DQ - Switzerland 81
DAW - Central Europe 34