The United States Geological Society has released a new interface to access and download maps from the USGS’s Historical Topographic Map Collection. The USGS's topoView allows you to search for historical maps of the United States and download them for free in a variety of formats.
To find historical maps for a particular area you can pan and zoom the map or enter a location into the search box. You can then use the timeline control to search for maps within a defined period of time. If any maps that meet your criteria are available a side-panel will slide in. Here you can browse and download any of the maps (in JPEG, KMZ GeoPDF or GeoTIFF formats).
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