RA Public aspects of medicine 74 K Law (General) 21 RA0421 Public health. Hygiene. Preventive Medicine 9 TA Engineering (General). Civil engineering (General) 5 P87-96 Communication. Mass media 3 QA Mathematics 3 H Social Sciences 2 QD Chemistry 2 T Technology (General) 2 BP Islam. Bahaism. Theosophy, etc 1 H Social Sciences (General) 1 HD59-59.6 Public relations. Industrial publicity 1 HM811-821 Deviant behavior. Social deviance 1 HV Social pathology. Social and public welfare 1 L Education 1 L Education (General) 1 LB Theory and practice of education 1 LC5201 Education extension. Adult education. Continuing education 1 PN4699-5650 Journalism. The periodical press, etc 1 Q Science (General) 1 R Medicine (General) 1 RZ Other systems of medicine 1 TH Building construction 1 TK Electrical engineering. Electronics Nuclear engineering 1 TP Chemical technology 1