"Player Pianos and Music Boxes (Keys to a Musical Past) " by Harvey N.Roehl. Published in 1968 by the Vestal Press, Vestal, NY. Soft cover, 48 pages with numerous black-and-white photographs and diagrams. The book measures 11 inches (28 cm) high by 8-1/2 inches (21.5 cm) wide.

The publisher's sub-title reads as follows:

"...Being an illustrated treatise on the various types of mechanical musical instruments which have enlightened the spirits of mankind over many decades,...with particular attention paid to pictures and advertising material from the early days, and special emphasis on the remarkable musical characteristics of these devices."