Sanborn Fire Insurance Maps
Need a map of an Ohio city? This database provides access to over 40,000 detailed city maps drawn between 1882 and 1962. From OWL.
Maps
Library of Congress
The website for the U.S. Library of Congress provides researchers with access to digitalized archives of primary historical sources (newspapers, letters, legal documents, books, photos, maps, blueprints, audio recordings, etc.), as well as finding aids and guides for topics ranging from legal research to genealogy and beyond. Take a look at their Research Tools webpage to get an idea of what they offer! [Beginner's Video Tutorial.]