http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Geology of the igneous rocks of Essex County, Massachusetts
1 online resource (132 pages, XVIII pages of plates) : illustrations, color maps.
Title from title screen (viewed July 3, 2014).
Includes bibliographical references and index.
Clapp, C.H. (Charles Horace), 1883-1935.
Washington [D.C.] : U.S. Govt. Print. Off., 1921
Bulletin (Geological Survey (U.S.)) ; no. 704