RA0421 Public health. Hygiene. Preventive Medicine 8 TH1-9745 Building construction 6 TX341-641 Nutrition. Foods and food supply 6 LB2300 Higher Education 5 Z Bibliography. Library Science. Information Resources 5 H1-99 Social sciences (General) 3 R Medicine 2 T1-995 Technology(General) 2 TP368-456 Food processing and manufacture 2 BF1-1999 Psychology, Parapsychology, Occult Sciences 1 CC Archaeology 1 H Social Sciences (General) 1 HC79 Special topics-Including air pollution, automation,consumer demand, famines, flow of funds,etc 1 J Political Science 1 L7-991 Education (General) 1 LC5800-5808 Distance education 1 P1-1091 Philology. Linguistics(General) 1 P87-96 Communication. Mass media 1 QA75.5-76.95 Electronic computers. Computer science 1 QH1 Natural history (General - Including nature conservation, geographical distribution) 1 RA Public aspects of medicine 1 RA440-440.87 Study and teaching. Research 1 RM300-666 Drugs and their actions 1 TN1-997 Mining engineering. Metallurgy 1 VM Naval architecture. Shipbuilding. Marine engineering 1