Classification
005 - Computer programming, programs & data
9
004 - Data processing & computer science
8
307 - Communities
6
327 - International relations
5
006 - Special computer methods
4
330 - Economics
4
363 - Other social problems & services
4
200 - Religion
3
301 - Sociology & anthropology
3
320 - Political science
3
333 - Economics of land & energy
3
551 - Geology, hydrology & meteorology
3
621 - Applied physics
3
000 - Computer science, information & general works
2
297 - Islam, Babism & Bahai Faith
2
355 - Military science
2
550 - Earth sciences
2
610 - Medicine & health
2
616 - Diseases
2
700 - The arts; fine & decorative arts
2
720 - Architecture
2
900 - History & geography
2
910 - Geography & travel
2
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
155 - Differential & developmental psychology
1
290 - Other religions
1
302 - Social interaction
1
304 - Factors affecting social behavior
1
305 - Social groups
1
306 - Culture & institutions
1
340 - Law
1
380 - Commerce, communications & transportation
1
491 - East Indo-European & Celtic languages
1
511 - General principles of mathematics
1
515 - Analysis
1
519 - Probabilities & applied mathematics
1
570 - Life sciences; biology
1
576 - Genetics & evolution
1
577 - Ecology
1
620 - Engineering & allied operations
1
624 - Civil engineering
1
628 - Sanitary & municipal engineering
1
630 - Agriculture & related technologies
1
658 - General management
1
955 - Iran
1