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A starting point for searching maps and other materials from the USGS
Finding and Downloading Historical USGS Topographic Maps
Historical topographic maps have been published by the USGS since 1884 in varying scales. Most of these maps can now be found online courtesy of the USGS through topoView, where map images can be downloaded and viewed, and the Historical Topographic Map Explorer, where maps can be downloaded and overlaid to male easy visual comparisons.
An easy interface for finding and downloading topographic maps published since 1884.
The USGS's topoView allows you to find and download historical maps, as well as .KML files to be overlaid in Google Earth. When searching for maps you have the options to filter your results by scale using the scale menu or by date using the time slider.
Overlaying Maps with the USGS Historical Topographic Map Explorer