Classification
358 - Air & other specialized forces
3
333 - Economics of land & energy
2
355 - Military science
2
616 - Diseases
2
016 - Bibliographies of works on specific subjects
1
331 - Labor economics
1
359 - Sea forces & warfare
1
362 - Social welfare problems & services
1
363 - Other social problems & services
1
407 - Education, research & related topics
1