GP7s, GP9s and GP18s at work on U.S. and Canadian railroads. Additional technical illustrations and B/W photographs are included to help you spot the subtle differences between the various production models that were manufactured from 1949 to late 1963. 2001 Kalmbach Books, inc. Softcover. Good condition, slight creasing to covers. 128pp. 8Z-WI2N-V4FJ
GM's Geeps. The General Purpose Diesels (Schneider)
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