OldMapsOnline not only provides access to historic maps from all over the world, but also provides interactive features for overlaying maps and exploring maps in the context of historical timelines.

Based on volumes held in the Geography & Map Division of the Library of Congress, this map pinpoints the correct Sanborn Fire Insurance Atlas volume for locations in Washington, D.C., and some of the surrounding suburbs in Prince George's and Montgomery Counties, Maryland. Date vary from 1916 to 1999.

The Digital Collections of the University of Maryland Libraries provides access to a wealth of resources, including historical documents, multimedia archives, and scholarly works. One of the Collecting Areas is the State of Maryland, which includes a collection of Maryland maps, a Maryland History and Culture Bibliography, and a gateway to digitized Maryland newspapers.