Classification
302 - Social interaction
2
331 - Labor economics
2
004 - Data processing & computer science
1
153 - Mental processes & intelligence
1
155 - Differential & developmental psychology
1
174 - Occupational ethics
1
305 - Social groups
1
325 - International migration & colonization
1
330 - Economics
1
338 - Production
1
358 - Air & other specialized forces
1
370 - Education
1
384 - Communications; telecommunication
1
507 - Education, research & related topics
1
612 - Human physiology
1
614 - Incidence & prevention of disease
1
781 - General principles & musical forms
1
790 - Recreational & performing arts
1
794 - Indoor games of skill
1
909 - World history
1