I end up searching for old maps every once in a while, and never remember the best way to do it.
- Start with David Rumsey’s site and use the “geofencer” tool
- Zoom in to the region of interest
- select maps on the right to overlay
- drag the maps to reorder them (bottom one seems to be on top)
- Find a map on David Rumsey’s site, and then click on “overlay and compare” to find other maps at the same location