Classification
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158 - Applied psychology
282
153 - Mental processes & intelligence
277
551 - Geology, hydrology & meteorology
264
384 - Communications; telecommunication
249
381 - Commerce
247
150 - Psychology
241
660 - Chemical engineering
238
001 - Knowledge
236
327 - International relations
236
371 - Schools & their activities; special education
220
613 - Personal health & safety
216
361 - Social problems & social welfare in general
213
579 - Microorganisms, fungi & algae
210
297 - Islam, Babism & Bahai Faith
209
615 - Pharmacology & therapeutics
207
581 - Specific topics in natural history
199
940 - History of Europe
198
364 - Criminology
193
307 - Communities
188
570 - Life sciences; biology
184
614 - Incidence & prevention of disease
182
910 - Geography & travel
179
418 - Standard usage & applied linguistics
178
621 - Applied physics
178
510 - Mathematics
171
530 - Physics
152
332 - Financial economics
149
378 - Higher education
149
362 - Social welfare problems & services
143
501 - Philosophy & theory
131
003 - Systems
125
174 - Occupational ethics
121
520 - Astronomy & allied sciences
120
617 - Surgery & related medical specialties
119
341 - Law of nations
116
540 - Chemistry & allied sciences
111
025 - Library operations
108
745 - Decorative arts
108
941 - British Isles
100
618 - Gynecology, obstetrics, pediatrics & geriatrics
99
808 - Rhetoric & collections of literature
98
296 - Judaism
97
398 - Folklore
96
909 - World history
96
770 - Photography, photographs & computer art
93
636 - Animal husbandry
90
664 - Food technology
89
641 - Food & drink
83
792 - Stage presentations
78
509 - Historical, geographic & persons treatment
77
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