A - General Works	41094
AC - Collections. Series.	13885
AE - Encyclopedias	1645
AG - Dictionaries and other reference	1311
AI - Indexes	513
AM - Museums. Collectors and collecting	2325
AN - Newspapers	194
AP - Periodicals	7767
AS - Academies and learned societies	16338
AY - Yearbooks. Almanacs. Directories	1358
AZ - History of scholarship and learning	1072
B - Philosophy; Psychology; Religion	86168
BC - Logic	3288
BD - Speculative philosophy	9591
BF - Psychology	38481
BH - Aesthetics	3069
BJ - Ethics	13222
BL - Religions. Mythology. Rationalism	40903
BM - Judaism	16296
BP - Islam. Bahaism. Theosophy	25356
BQ - Buddhism	16380
BR - Christianity	26965
BS - The Bible	29308
BT - Doctrinal Theology	17919
BV - Practical Theology	27033
BX - Christian Denominations	80438
C - Auxiliary Science of History	24195
CB - History of Civilization	7236
CC - Archaeology	2509
CD - Diplomatics. Archives. Seals	7509
CE - Technical Chronology. Calendar	905
CJ - Numismatics	3997
CN - Inscriptions. Epigraphy	1610
CR - Heraldry	2832
CS - Genealogy	28512
CT - Biography	13026
D - History General	93709
DA - History of Great Britain - History of Ireland - History of the British Isles	46421
DB - History of Austria - Liechtenstein - Hungary - Czechoslovakia	17456
DC - History of France - Andorra - Monaco	41783
DD - History of Germany	37838
DE - History of the Greco-Roman World	1899
DF - History of Greece	9737
DG - History of Italy - Malta	31335
DH - History of Low Countries - Benelux Countries	3018
DJ - History of the Netherlands	2823
DK - History of Russia; Soviet Union; Former Soviet Republics - History of Poland	55623
DL - History of Northern Europe; Scandavia	9447
DP - History of Spain - Portugal	22910
DQ - History of Switzerland	2974
DR - History of the Balkan Peninsula	19232
DS - History of Asia	188420
DT - History of Africa	36242
DU - History of Oceania (South Seas)	9494
DX - History of Gypsies	652
E - History of America	115651
F - Local History of the United States and British; French; and Latin America	216530
G - Geography; Anthropology; Recreation	45880
GA - Mathematical geography; Cartography	2301
GB - Physical geography	16342
GC - Oceanography	8895
GE - Environmental Sciences	3019
GF - Human ecology; Anthropogeography	2519
GN - Anthropology	22455
GR - Folklore	19677
GT - Manners and customs (General)	9736
GV - Recreation; Leisure	27715
H - Social sciences (General)	28656
HA - Statistics	16359
HB - Economic theory; Demography	43116
HC - Economic history and conditions	103847
HD - Industries; Land use; Labor	199493
HE - Transportation and communications	34774
HF - Commerce	63661
HG - Finance	54194
HJ - Public Finance	25899
HM - Sociology (General)	16907
HN - Social history and conditions; Social problems; Social reform	26912
HQ - The family; Marriage; Woman; Sexuality	50411
HV - Social pathology; Social and public welfare ; Criminology	59678
HX - Socialism. Communism. Anarchism	21485
J - General legislative and executive papers	16958
JA - Political science (General)	7042
JC - Political theory. The state. Theories of the state.	18748
JF - Political institutions and public administration - General	5682
JJ - Political institutions and public administration - North America	7
JK - Political institutions and public administration - United States	20321
JL - Political institutions and public administration - Canada; Latin America; etc.	13903
JN - Political institutions and public administration - Europe	24789
JQ - Political Institutions and public administration - Asia; Africa; Australia; Pacific Area; etc.	19532
JS - Local government. Municipal government	12265
JV - Colonies and colonization. Emigration and Immigration. International migration	6855
JX - International law (obsolete)	23019
JZ - International relations	3713
K - Law	32826
KB - Religious law	1742
KD-KDK - Law (United Kingdom and Ireland	6922
KE - Law (Canada)	1973
KF - Law (United States)	75756
KG - Law (Latin America - Mexico and Central America - West Indies. Caribbean area)	5463
KH - Law (South America)	8991
KJ - Law (Europe)	9045
KL - Law (History of law. The ancient orient)	2353
KZ - Law of Nations. International law	2879
L - Education	24146
LA - History of Education	24228
LB - Theory and practice of education	61548
LC - Special aspects of education	28206
LD - Education (Individual Institutions - United States)	33240
LE - Education (Individual Institutions - America (except United States))	2343
LF - Education (Individual Institutions - Europe)	4344
LG - Education (Individual Institutions - Asia; Africa; Indian Ocean Islands; Australia; New Zealand; Pacific Islands)	2028
LH - College and school magazines and papers	356
LJ - Student fraternities; United States	439
LT - Textbooks	318
M - Printed Music	100719
ML - Literature on music	52130
MT - Musical instruction and study	9312
N - Visual arts	75403
NA - Architecture	43154
NB - Sculpture	11306
NC - Drawing. Design. Illustration	11660
ND - Painting	44749
NE - Print media	7030
NK - Decorative arts	23219
NX - Arts in general	6665
P - Language and Literature	47172
PA - Greek and Latin language and literature	46636
PB - Modern languages; Celtic languages	3480
PC - Romanic languages	26288
PE - English language	16334
PF - West Germanic languages	9155
PG - Slavic languages; Baltic languages; Albanian language	103328
PH - Uralic languages; Basque language	9630
PJ - Oriental philology and literature	42992
PK - Indo-Iranian philology and literature	68346
PL - Languages of Eastern Asia; Africa; Oceania	144447
PM - Hyperborean; Indian; and artificial languages	5524
PN - Literature (General)	106778
PQ - French literature - Italian literature - Spanish literature - Portuguese literature	311652
PR - English literature	137352
PS - American literature	117346
PT - German; Dutch; Scandinavian; Old Norse; Old Icelandic; Old Norwegian; Modern Icelandic; Faroese; Danish; Norwegian; and Swedish literature; Flemish literature since 1830	146682
PZ - Fiction and juvenile belles lettres	74751
Q - Science (General)	27756
QA - Mathematics	69400
QB - Astronomy	15989
QC - Physics	48764
QD - Chemistry	26340
QE - Geology	37637
QH - Natural history - Biology	33808
QK - Botany	26887
QL - Zoology	44823
QM - Human anatomy	3678
QP - Physiology	21223
QR - Microbiology	6439
R - Medicine (General)	33643
RA - Public aspects of medicine	28273
RB - Pathology	4077
RC - Internal medicine	47884
RD - Surgery	9161
RE - Ophthalmology	4089
RF - Otorhinolaryngology	1583
RG - Gynecology and obstetrics	5365
RJ - Pediatrics	7946
RK - Dentistry	4497
RL - Dermatology	1116
RM - Therapeutics. Pharmacology	8157
RS - Pharmacy and materia medica	4246
RT - Nursing	4945
RV - Botanic; Thomsonian; and eclectic medicine	129
RX - Homeopathy	612
RZ - Other systems of medicine	685
S - Agriculture (General)	72462
SB - Plant culture	37383
SD - Forestry	17783
SF - Animal culture	20191
SH - Aquaculture. Fisheries. Angling.	12723
SK - Hunting sports	5093
T - Technology (General)	32587
TA - Engineering (General). Civil Engineering	30021
TC - Hydraulic engineering - Ocean Engineering	9144
TD - Environmental technology. Sanitary engineering	20152
TE - Highway engineering. Roads and pavements	5201
TF - Railroad engineering and operation	2971
TG - Bridge engineering	2231
TH - Building construction	8636
TJ - Mechanical engineering and machinery	14742
TK - Electrical engineering. Electronics. Nuclear engineering	29036
TL - Motor vehicles. Aeronautics. Astronautics	26092
TN - Mining engineering. Metallurgy	20160
TP - Chemical technology	17713
TR - Photography	12844
TS - Manufactures	13519
TT - Handicrafts. Arts and crafts	6322
TX - Home economics	19026
U - Military Science (General)	13665
UA - Armies: Organization; distribution; military situation	11652
UB - Military administration	4161
UC - Maintenance and transportation	1177
UD - Infantry	488
UE - Cavalry. Armor	221
UF - Artillery	1349
UG - Military engineering	4137
UH - Other services	753
V - Naval science (General)	12250
VA - Navies: Organization; distribution; naval situation	1674
VB - Naval administration	324
VC - Naval maintenance	197
VD - Naval seaman	21
VE - Marines	297
VF - Naval ordnance	442
VG - Minor services of navies	565
VK - Navigation. Merchant marine	3305
VM - Naval architecture. Shipbuilding. Marine engineering	3593
Z - Books (General). Writing. Paleography. Book industries and trade. Libraries. Bibliography	120527
ZA - Information Resources	482
Total volumes: 5936381