A - General Works 6,964
B - Philosophy, Psychology, Religion 101,630
C - Historical Sciences 5,833
D - World History 65,894
E - United States History 183,756
F - General American History 15,305
G - Geography, Anthropology, Recreation 18,242
H - Social Science 108,318
J - Political Science 25,911
K - Law 19,584
L - Education 21,822
M - Music 91,696
N - Fine Arts 62,445
P - Language and Literature 160,248
Q - Science 61,285
R - Medicine 32,299
S - Agriculture 8,428
T - Technology 30,152
U - Military Science 4,769
V - Naval Science 1,636
Z - Library Science 5,378
HD - Industries, Land Use, Labor 21,645
HV - Social Pathology, Criminology 13,261
HQ - Family, Marriage, Women 12,940
HF - Commerce 12,000
HC - Economic History and Conditions 9,577
HM - Sociology 7,306
HG - Finance 6,934
HB - Economic Theory and Demography 6,342
HT - Communities, Classes, Races 5,244
HN - Social History and Conditions 4,540
HX - Socialism, Communism, Anarchism 2,118
HE - Transportation and Communications 1,779
HJ - Public Finance 1,624
H - Social Science 1,496
HA - Statistics 599
HS - Societies 220