Treasure maps in the Library of Congress;
an annotated list,
compiled by J. Douglas Hill and Richard S. Ladd.
Library of Congress. Map Division., Ladd, R. S. (Richard Stockwell)., Hill, J. Douglas. (1955). Treasure maps in the Library of Congress: an annotated list. Washington.
Library of Congress. Map Division, Richard S. (Richard Stockwell) Ladd, and James Douglas Hill. Treasure Maps In the Library of Congress: an Annotated List. Washington, 1955.
Warning: These citations may not always be complete (especially for serials).