Why The Wheels Turn A Primer On Plymouth brochure. This brochure illustrates the science and engineering that makes any automobile work. The book has a 1941 quality Twenty-two Features comparison chart of three Plymouths against other makes/models (i.e., Cadillac, Buick, Nash, others). Also discussed the benefits of those features (i.e., Hydraulic brakes, Valve tappet adjustment, Rustproofed body, and more). The back cover page has illustrated pictures of the 1941 Plymouths with Best-Engineered Low-Price Cars, and commercial cars as well (sedan, coupe, wagon, convertible, Utility, pick-up, ambulance, etc.). Measures 11.25 x 9 with 24 pages. Printed in U.S.A. -4559-L-12-40.