Classification
384 - Communications; telecommunication
42
331 - Labor economics
30
004 - Data processing & computer science
27
620 - Engineering & allied operations
25
621 - Applied physics
21
600 - Technology
14
700 - The arts; fine & decorative arts
14
330 - Economics
12
000 - Computer science, information & general works
11
380 - Commerce, communications & transportation
9
500 - Natural sciences & mathematics
8
900 - History & geography
8
333 - Economics of land & energy
7
658 - General management
5
610 - Medicine & health
3
304 - Factors affecting social behavior
2
414 - Phonology & phonetics
2
530 - Physics
2
140 - Specific philosophical schools
1
320 - Political science
1
338 - Production
1
340 - Law
1
363 - Other social problems & services
1
370 - Education
1
374 - Adult education
1
510 - Mathematics
1
540 - Chemistry & allied sciences
1
541 - Physical chemistry
1
543 - Analytical chemistry
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
630 - Agriculture & related technologies
1
667 - Cleaning, color & coating technologies
1
668 - Technology of other organic products
1