Tractor principles; the action, mechanism, handling, care, maintenance and repair of the gas engine tractor T Technology
Soap-making manual; a practical handbook on the raw materials, their manipulation, analysis and control in the modern soap plant T Technology
Radio-telephony for everyone; the wireless: how to construct and maintain modern transmitting and receiving apparatus T Technology
“WWJ–The Detroit news”; the history of Radiophone broadcasting by the earliest and foremost of newspaper stations ; together with information on radio for amateur and expert T Technology
Motor vehicles and their engines; a practical handbook on the care, repair and management of motor trucks and automobiles, for owners, chauffeurs, garagemen and schools T Technology
