The four views shown in this set of stamps represent four examples of American history from diverse parts of the country. The eight-cent Historic Preservation Series stamps were first placed on sale at San Diego, CA, on October 29, 1971. Featured in the series is the Decatur House in Washington, DC, the whaling ship 'Charles W. Morgan' in Mystic, CT, the San Francisco Cable Cars, and San Xavier del Bac Mission in Tuscon, AZ.