TA Engineering (General). Civil engineering (General) 18 TP Chemical technology 12 QA75 Electronic computers. Computer science 5 QA Mathematics 3 GE Environmental Sciences 2 Q Science (General) 2 T Technology (General) 2 TC Hydraulic engineering. Ocean engineering 2 TC530-537 River protective works. Regulation. Flood control 2 TD Environmental technology. Sanitary engineering 2 TN Mining engineering. Metallurgy 2 Applications of electronics 1 Aquatic insects 1 Benthic macroinvertebrates 1 Community composition 1 Enviromental management 1 Environmental policy 1 HD1394-1394.5 Real estate management 1 HD30.213 Management information systems. Decision support systems 1 HN Social history and conditions. Social problems. Social reform 1 Habitat use 1 Hydrology. Water 1 Kick sampling 1 Light trapping 1 NA Architecture 1 Northland 1 QA76 Computer software 1 R Medicine (General) 1 River protective works. Regulation. Flood control 1 Sticky trapping 1