One of eight large-scale pictorial maps of midwestern states showing routes and post offices of the Railway Mail Service. Designed by Chicago railway mail clerk Frank H. Galbraith to help employees of the Railway Mail Service quickly locate counties and post offices. The maps were rented for practicing or prospective workers who numbered over 6,000 and travelled over a million miles a year on the rails sorting mail. A printed title cartouche accompanied by a list of counties for each of the states by McEwen Map Company of Chicago is pasted on the maps.

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