MapTech: Historical Topographic Maps
MapTech: Historical Topographic Maps offers scanned USGS maps from 14 states in the Northeastern U.S.—as far south as Virginia, and as far west as Ohio. These are gloriously outdated maps, the earliest of which date back well over a century, and usually show the locations of schools, churches, and dwellings. Maps for a given town may be available over a span of several decades, allowing a genealogist to date the relocation of a road, or the presence or absence of a particular building. Use them also to locate old cemeteries, some of which may not appear on current topo maps.