This is a great tool I can’t wait to use in my class!
Maps are so cool. Historical maps are way more cooler. And online historical maps are even way more cooler. (I like saying way more cooler cause it makes me feel like a rebel.)
A couple of weeks ago on the helpful GoogleMapsMania site, I ran across a way cool tool created by the United States Geological Survey. This is the group that, among other things, is responsible for creating topographic maps.
The cool tool that the USGS has created is called USGS Historical Topographic Map Explorer.
Basically, you do a map search with a Google Maps-like interface, click on a specific place on the resulting map, and the Historical Topographic Map Explorer will provide a timeline with topo maps from the past.
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