Historic USGS Topo Maps discussion
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Historic USGS Topo Maps
Over 1,000 historic USGS Topographic maps covering large areas of the United States. The maps are available in various scales and date back to the late 1800s in some areas.
I just finished adding about 900 more historic USGS topo maps to this collection. The latest additions cover almost the entire states of Connecticut, Delaware, Massachusetts, Maryland, Maine, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island and Vermont. Most of the maps are dated between 1890 and 1910. This collection now contains over 2,000 historic USGS topographic maps.
More info here