TK - Electrical and Nuclear Engineering 158,662
TA - General and Civil Engineering 120,081
TR - Photography 96,279
TX - Home Economics 91,394
TL - Motor Vehicles and Aeronautics 76,720
TD - Environmental Technology 68,849
T - General Technology 64,093
TP - Chemical Technology 58,417
TN - Mining Engineering and Metallurgy 55,847
TJ - Mechanical Engineering and Machinery 53,511
TS - Manufactures 42,231
TH - Building Construction 29,594
TC - Hydraulic and Ocean Engineering 24,212
TT - Arts and Crafts 17,155
TE - Highway Engineering 10,820
TF - Railroad Engineering and Operation 10,484
TG - Bridge Engineering 5,775
F - General American History 2
B - Philosophy 1
CE - Technical Chronology, Calendar 1
E - United States History 1
Q - General Science 1