TP Chemical technology 135 QD Chemistry 79 TA Engineering (General). Civil engineering (General) 29 Q Science (General) 24 R Medicine (General) 17 T Technology (General) 12 QH Natural history 10 QK Botany 10 TK Electrical engineering. Electronics Nuclear engineering 9 TD Environmental technology. Sanitary engineering 8 RA0421 Public health. Hygiene. Preventive Medicine 7 TJ Mechanical engineering and machinery 7 Q Science 6 QC Physics 6 RS1-441 Pharmacy and materia medica 6 QH301 Biology 5 Unspecified 4 Antibacterial agents 3 Fruit and fruit culture 3 QH1 Natural history (General - Including nature conservation, geographical distribution) 3 QR Microbiology 3 RA Public aspects of medicine 3 TX341-641 Nutrition. Foods and food supply 3 Antioxidants 2 Botanical chemistry. Phytochemicals 2 Extraction (Chemistry) 2 HD28-70 Management. Industrial Management 2 Immunology 2 Individual drugs and other agents 2 Medical botany (General) 2