Nearly 90,000 high resolution scans of the more than 200,000 historical USGS topographic maps, some dating as far back as 1884, are now available on-line from the US Geological Survey. The Historical Topographic Map Collection includes published U.S. topographic maps of  all scales and editions, and are offered as a georeferenced digital download or as a printed copy from the USGS Store.

Additional states (including Connecticut) will be added soon! For additional details and to access these maps visit: http://nationalmap.gov/historical/