Locomotive Valves and Valve Gears 
by: Yoder Jacob & Wharen George

Softcover. Warwickshire UK, TEE Publishing, reprint, 1993, Book: Very Good, Dust Jacket: None, Softcover, 272 pages, b&w illustrations. With a Special Treatise on Valve Setting: An Explanation of the Construction and Action of the Plain Slide Valve the Piston Valve and the Gears Which Operate Them as Applied to Locomotives. Originally published in 1917. Clean copy.