TK - Electrical and Nuclear Engineering 159,133
TA - General and Civil Engineering 120,268
TR - Photography 96,544
TX - Home Economics 91,525
TL - Motor Vehicles and Aeronautics 76,812
TD - Environmental Technology 68,949
T - General Technology 64,213
TP - Chemical Technology 58,510
TN - Mining Engineering and Metallurgy 55,870
TJ - Mechanical Engineering and Machinery 53,604
TS - Manufactures 42,296
TH - Building Construction 29,649
TC - Hydraulic and Ocean Engineering 24,232
TT - Arts and Crafts 17,189
TE - Highway Engineering 10,830
TF - Railroad Engineering and Operation 10,493
TG - Bridge Engineering 5,780
F - General American History 2
B - Philosophy 1
CE - Technical Chronology, Calendar 1
E - United States History 1
Q - General Science 1