R Medicine 123 RA0421 Public health. Hygiene. Preventive Medicine 119 TP368-456 Food processing and manufacture 41 R Medicine (General) 40 R5-920 Medicine (General) 35 TX341-641 Nutrition. Foods and food supply 28 RC Internal medicine 27 RA Public aspects of medicine 24 RS1-441 Pharmacy and materia medica 12 LB2300 Higher Education 10 RC31-1245 Internal medicine 8 RK1-715 Dentistry 7 RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry 6 R5-130.5 General works 5 RZ Other systems of medicine 4 R735-854 Medical education. Medical schools. Research 3 RM Therapeutics. Pharmacology 3 RV Botanic, Thomsonian, and eclectic medicine 3 HC79 Special topics-Including air pollution, automation,consumer demand, famines, flow of funds,etc 2 LC5800-5808 Distance education 2 P1-1091 Philology. Linguistics(General) 2 QH1 Natural history (General - Including nature conservation, geographical distribution) 2 QH426-470 Genetics 2 QR180-189.5 Immunology 2 RA1190-1270 Toxicology. Poisons 2 RA440-440.87 Study and teaching. Research 2 RE Ophthalmology 2 RF Otorhinolaryngology 2 RG Gynecology and obstetrics 2 RS Pharmacy and materia medica 2