This offering is for a course in Air Conditioning, Industrial training and includes the following: Series A-Introduction to Air conditioning, on book. Series B-Refrigeration, parts 1-5, 5 books. Series D-auxilliary equipment, parts 1 and 2, 2 books. Series E-field engineering, part 1, basic principles and part 2, load estimates, 2 books. All the books are spiral bound with red and black covers. The books show use but are compete, generally similar condition. Rubbing or wear on the coves, some edge and corner wear, and a little mild soiling. Rare mark or three.