Very neat old manuals from the International Textbook Company of Scranton, PA, copyright 1935 & 1936. Set of 4, including #150B Rectifiers-Converters-Motor Applications, #357 High-Speed Diesel Engines, Gas-Diesel Engine Auxiliaries Testing, #555 B Alternators and AC Motors. Very neat old manuals, in great, readable shape with minor signs of wear on covers. Hardback. I have a good number of these, please convo me if you are looking for a specific volume or subject.