TK - Electrical and Nuclear Engineering 158,865
TA - General and Civil Engineering 120,155
TR - Photography 96,392
TX - Home Economics 91,469
TL - Motor Vehicles and Aeronautics 76,769
TD - Environmental Technology 68,899
T - General Technology 64,169
TP - Chemical Technology 58,471
TN - Mining Engineering and Metallurgy 55,865
TJ - Mechanical Engineering and Machinery 53,547
TS - Manufactures 42,257
TH - Building Construction 29,611
TC - Hydraulic and Ocean Engineering 24,228
TT - Arts and Crafts 17,171
TE - Highway Engineering 10,823
TF - Railroad Engineering and Operation 10,491
TG - Bridge Engineering 5,779
F - General American History 2
B - Philosophy 1
CE - Technical Chronology, Calendar 1
E - United States History 1
Q - General Science 1