Databases by what you can do with them find maps.
Bell & Howell Information and Learning's Digital Sanborn Maps, 1867-1970 provides academic and public libraries digital access to more than 660,000 large-scale maps of more than 12,000 American towns and cities. Users have the ability to easily manipulate the maps, magnify and zoom in on specific sections, and layer maps from different years. Our subscription includes the Maryland maps from 1890-1953.
(Accessible in all Pratt Library Locations, or from home with your library card)