YMCA USA 1910 Principal RR lines Transportation freight lg. folding pocket map(Old Maps, North America, United States, Transportation Maps, Pocket Maps). Map of the Principal Transportation Lines of the United States. Traffic Management S Published 1910, New York by Association Press for United YMCA Schools. Folding map. Text in English. Publisher's heavy paper wrappers containing a large fold out pocket map of the U. S. A. An extensive key at bottom right notes the numerous principal rail lines, a distance scale at lower left.