TR - Photography 4,509
T - General Technology 690
TK - Electrical and Nuclear Engineering 673
TD - Environmental Technology 635
TX - Home Economics 523
TL - Motor Vehicles and Aeronautics 437
TP - Chemical Technology 394
TS - Manufactures 308
TA - General and Civil Engineering 307
TN - Mining Engineering and Metallurgy 279
TT - Arts and Crafts 260
TJ - Mechanical Engineering and Machinery 211
TH - Building Construction 166
TC - Hydraulic and Ocean Engineering 117
TF - Railroad Engineering and Operation 55
TG - Bridge Engineering 32
TE - Highway Engineering 11