Note that not all of our maps are cataloged. Use similar techniques to search WorldCat (a catalog of the holdings of most major libraries in the U.S.), HathiTrust (great for federal government publications and materials published before 1923), and the Catalog of U.S. Government Publications (for Federal government publications after 1976; use advanced search).
Sheet maps in Bowdoin College Library are held in the collections listed below.
The following major sheet map series are held in the small Maps Collection in H-L Library. (The Maps Collection is on the lower level near the microforms.)