vintage Chrysler service reference books, Lot of 4 early 1950s auto mechanics illustrated guides

Lot of four early 1950s illustrated automotive repair guides for gas stations and auto mechanics. They are dated 1950 and 1951.

These have between 22 and 35 pages and they are published by Chrysler Corporation for Plymouth, Dodge, De Soto and Chrysler divisions.

These have wear, discoloration and water staining toward the bottoms.