Classification
658 - General management
29
300 - Social sciences
18
302 - Social interaction
18
610 - Medicine & health
14
305 - Social groups
12
306 - Culture & institutions
11
616 - Diseases
11
330 - Economics
10
320 - Political science
8
340 - Law
7
338 - Production
6
620 - Engineering & allied operations
6
650 - Management & auxiliary services
6
780 - Music
6
900 - History & geography
6
370 - Education
5
550 - Earth sciences
5
301 - Sociology & anthropology
4
617 - Surgery & related medical specialties
4
624 - Civil engineering
4
005 - Computer programming, programs & data
3
304 - Factors affecting social behavior
3
621 - Applied physics
3
782 - Vocal music
3
910 - Geography & travel
3
050 - General serial publications
2
342 - Constitutional & administrative law
2
361 - Social problems & social welfare in general
2
381 - Commerce
2
510 - Mathematics
2
512 - Algebra
2
519 - Probabilities & applied mathematics
2
570 - Life sciences; biology
2
571 - Physiology & related subjects
2
577 - Ecology
2
615 - Pharmacology & therapeutics
2
618 - Gynecology, obstetrics, pediatrics & geriatrics
2
628 - Sanitary & municipal engineering
2
700 - The arts; fine & decorative arts
2
002 - The book
1
004 - Data processing & computer science
1
006 - Special computer methods
1
017 - General subject catalogs
1
142 - Critical philosophy
1
150 - Psychology
1
155 - Differential & developmental psychology
1
158 - Applied psychology
1
193 - Philosophy of Germany & Austria
1
200 - Religion
1
233 - Humankind
1
more ...