Most of the UMD Libraries' maps of Maryland and the Chesapeake Bay region, especially historical maps, are found in the Maryland Map Collection at Hornbake Library.
In McKeldin Library's map collection, you will find USGS topographic maps of Maryland and the surrounding region, as well as soil maps. You will also find the Congressional Serial Set maps, which include maps of Maryland and the region and are searchable and downloadable through the Congressional (Proquest) database.