A - General Works 6,947
B - Philosophy, Psychology, Religion 101,284
C - Historical Sciences 5,775
D - World History 65,731
E - United States History 183,717
F - General American History 15,302
G - Geography, Anthropology, Recreation 18,208
H - Social Science 108,286
J - Political Science 25,861
K - Law 19,556
L - Education 21,811
M - Music 91,681
N - Fine Arts 61,355
P - Language and Literature 160,138
Q - Science 61,256
R - Medicine 32,279
S - Agriculture 8,335
T - Technology 30,106
U - Military Science 4,763
V - Naval Science 1,636
Z - Library Science 5,355
DS - Asia 15,572
D - General History 12,400
DA - Great Britain 9,077
DT - Africa 4,170
DC - France, Andorra, Monaco 3,873
DG - Italy, Malta 3,459
DK - Russia, Soviet Union, Former Soviet Republics, Poland 3,311
DD - Germany 2,512
DF - Greece 1,935
DP - Spain, Portugal 1,325
DR - Balkan Peninsula 1,077
DU - Oceania (South Seas) 988
DB - Austria, Liechtenstein, Hungary, Czechoslovakia 676
DE - Grecco-Roman World 362
DL - Northern Europe, Scandinavia 310
DH - Low Countries 198
DJK - Eastern Europe (General) 188
DJ - Netherlands (Holland) 144
DQ - Switzerland 80
DX - Gypsies 79
DAW - Central Europe 27