These are three essential books on the Southern Pacific Narrow Gauge and the SP Standard Depots, published by the Southern Pacific Historical and Technical Society. They are:1. Southern Pacific's Slim Princess in the Sunset, 1940-1960, Joe Dale Morris2. Southern Pacific Narrow Gauge Locomotives and Freight Equipment, Robert Bader 3. Southern Pacific Standard Design Depots, Henry Bender New, these are $70.00 each, making for a total of $210.00. I bought them and have hardly touched them, so though I list them as used because they are secondhand, they are basically new. I am offering them for the beginning price of $99.00, and the outstanding buy-it-now price of $128.70!