Classification
380 - Commerce, communications & transportation
1,532
330 - Economics
664
333 - Economics of land & energy
359
629 - Other branches of engineering
309
620 - Engineering & allied operations
305
600 - Technology
303
700 - The arts; fine & decorative arts
296
000 - Computer science, information & general works
253
363 - Other social problems & services
253
320 - Political science
247
610 - Medicine & health
206
900 - History & geography
201
621 - Applied physics
119
140 - Specific philosophical schools
95
658 - General management
90
500 - Natural sciences & mathematics
88
388 - Transportation; ground transportation
87
580 - Plants (Botany)
86
576 - Genetics & evolution
76
340 - Law
75
551 - Geology, hydrology & meteorology
75
304 - Factors affecting social behavior
58
624 - Civil engineering
45
910 - Geography & travel
44
540 - Chemistry & allied sciences
42
571 - Physiology & related subjects
42
570 - Life sciences; biology
41
530 - Physics
39
612 - Human physiology
39
414 - Phonology & phonetics
35
006 - Special computer methods
34
572 - Biochemistry
32
720 - Architecture
32
630 - Agriculture & related technologies
30
615 - Pharmacology & therapeutics
26
004 - Data processing & computer science
25
338 - Production
25
581 - Specific topics in natural history
25
370 - Education
23
690 - Buildings
21
800 - Literature & rhetoric
19
660 - Chemical engineering
18
360 - Social problems & services; associations
17
387 - Water, air & space transportation
17
300 - Social sciences
16
307 - Communities
16
628 - Sanitary & municipal engineering
16
331 - Labor economics
14
541 - Physical chemistry
14
400 - Language
12
more ...