The USGS 15-minute map series features early topographic maps. The date varies by quadrangle and some quadrangles have several editions. Just select a quadrangle. This takes you to the map download page where thumbnails of each map available for that 15-minute quadrangle are shown for download.
The 15-minute map series at a scale of 1:62,500 (1 inch = approximately 1 mile) has been abandoned. The USGS 7.5-minute topographic quadrangle map series is the official replacement for the 1:62,500-scales series. To obtain 7.5-minute topographic quadrangles visit the USGS Store.