Classification
551 - Geology, hydrology & meteorology
346
550 - Earth sciences
27
630 - Agriculture & related technologies
22
363 - Other social problems & services
21
549 - Mineralogy
20
910 - Geography & travel
19
560 - Paleontology; paleozoology
18
700 - The arts; fine & decorative arts
18
577 - Ecology
16
333 - Economics of land & energy
14
620 - Engineering & allied operations
12
414 - Phonology & phonetics
11
600 - Technology
11
624 - Civil engineering
10
621 - Applied physics
9
330 - Economics
5
580 - Plants (Botany)
5
628 - Sanitary & municipal engineering
5
000 - Computer science, information & general works
4
570 - Life sciences; biology
4
576 - Genetics & evolution
4
631 - Techniques, equipment & materials
4
380 - Commerce, communications & transportation
3
526 - Mathematical geography
3
541 - Physical chemistry
3
553 - Economic geology
3
579 - Microorganisms, fungi & algae
3
610 - Medicine & health
3
900 - History & geography
3
930 - History of ancient world to ca. 499
3
140 - Specific philosophical schools
2
500 - Natural sciences & mathematics
2
571 - Physiology & related subjects
2
581 - Specific topics in natural history
2
304 - Factors affecting social behavior
1
340 - Law
1
370 - Education
1
400 - Language
1
520 - Astronomy & allied sciences
1
530 - Physics
1
540 - Chemistry & allied sciences
1
543 - Analytical chemistry
1
546 - Inorganic chemistry
1
552 - Petrology
1
622 - Mining & related operations
1
634 - Orchards, fruits & forestry
1
658 - General management
1