Clapp, F. G. (1907). Geologic atlas of U.S.: Amity folio, Pennsylvania. [s.n.].
Chicago Style (17th ed.) CitationClapp, Frederick G. Geologic Atlas of U.S.: Amity Folio, Pennsylvania. Washington, D.C.: [s.n.], 1907.
MLA (8th ed.) CitationClapp, Frederick G. Geologic Atlas of U.S.: Amity Folio, Pennsylvania. [s.n.], 1907.
Warning: These citations may not always be 100% accurate.