Your genealogy map collection needs to contain not only modern maps, but also maps contemporary to the time period being researched. Jurisdictional lines lines change, names of streets change, names of political entities change, new counties are formed, etc.
It also never hurts to remind yourself of the distance scale–so you know how far apart two places really were. That’s especially important in a time when travel was not via motorized vehicle.
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I have various maps of different time periods because even the time since I’ve been out of school boarders have changed.