Historical Transportation of Navigable Rivers, Canals, and Railroads in the United States
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资源简介：
This collection contains GIS materials which cover the spread of different modes of transportation in the lower 48 states from America's founding through (approximately) 1911. There are three transportation modes included in this collection: canals, steamboat-navigated (as opposed to simply navigable) rivers, and railroads. The GIS materials can be downloaded by accessing the "Other" link.
创建时间：
2016-01-01
