Classification
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613 - Personal health & safety
5
612 - Human physiology
4
670 - Manufacturing
4
770 - Photography, photographs & computer art
4
338 - Production
3
550 - Earth sciences
3
621 - Applied physics
3
660 - Chemical engineering
3
303 - Social processes
2
305 - Social groups
2
332 - Financial economics
2
403 - Dictionaries & encyclopedias
2
440 - Romance languages; French
2
520 - Astronomy & allied sciences
2
570 - Life sciences; biology
2
001 - Knowledge
1
003 - Systems
1
020 - Library & information sciences
1
155 - Differential & developmental psychology
1
160 - Logic
1
296 - Judaism
1
306 - Culture & institutions
1
336 - Public finance
1
350 - Public administration & military science
1
353 - Specific fields of public administration
1
355 - Military science
1
360 - Social problems & services; associations
1
364 - Criminology
1
365 - Penal & related institutions
1
371 - Schools & their activities; special education
1
398 - Folklore
1
414 - Phonology & phonetics
1
507 - Education, research & related topics
1
579 - Microorganisms, fungi & algae
1
590 - Animals (Zoology)
1
614 - Incidence & prevention of disease
1
618 - Gynecology, obstetrics, pediatrics & geriatrics
1
629 - Other branches of engineering
1
631 - Techniques, equipment & materials
1
651 - Office services
1
697 - Heating, ventilating & air-conditioning
1
740 - Drawing & decorative arts
1
891 - East Indo-European & Celtic literatures
1
947 - Eastern Europe; Russia
1
949 - Other parts of Europe
1
956 - Middle East (Near East)
1