Classification
330 - Economics
347
333 - Economics of land & energy
55
630 - Agriculture & related technologies
29
363 - Other social problems & services
28
307 - Communities
19
338 - Production
19
320 - Political science
18
000 - Computer science, information & general works
13
300 - Social sciences
12
700 - The arts; fine & decorative arts
12
900 - History & geography
11
140 - Specific philosophical schools
10
600 - Technology
10
658 - General management
9
304 - Factors affecting social behavior
7
380 - Commerce, communications & transportation
7
551 - Geology, hydrology & meteorology
7
580 - Plants (Botany)
7
610 - Medicine & health
7
301 - Sociology & anthropology
6
620 - Engineering & allied operations
5
576 - Genetics & evolution
4
581 - Specific topics in natural history
4
331 - Labor economics
3
361 - Social problems & social welfare in general
3
362 - Social welfare problems & services
3
720 - Architecture
3
200 - Religion
2
303 - Social processes
2
332 - Financial economics
2
370 - Education
2
100 - Philosophy & psychology
1
170 - Ethics
1
297 - Islam, Babism & Bahai Faith
1
306 - Culture & institutions
1
339 - Macroeconomics & related topics
1
340 - Law
1
372 - Elementary education
1
388 - Transportation; ground transportation
1
414 - Phonology & phonetics
1
500 - Natural sciences & mathematics
1
520 - Astronomy & allied sciences
1
540 - Chemistry & allied sciences
1
570 - Life sciences; biology
1
942 - England & Wales
1
959 - Southeast Asia
1
966 - West Africa & offshore islands
1