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H. Doc. 66-571 - Geology of the igneous rocks of Essex County, Massachusetts, by Charles H. Clapp. [U.S. Geological Survey Bulletin 707.]
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U.S. Congress. House of Representatives. Geology of the igneous rocks of Essex County, Massachusetts, by Charles H. Clapp. [U.S. Geological Survey Bulletin 707.]. 66th Cong., 2nd sess., 1920. 66-571. https://www.govinfo.gov/app/details/SERIALSET-07713_00_00-004-0571-0000.
House of Representatives, Congress. (1920, January 1). H. Doc. 66-571 - Geology of the igneous rocks of Essex County, Massachusetts, by Charles H. Clapp. [U.S. Geological Survey Bulletin 707.]. [Government]. U.S. Government Printing Office. https://www.govinfo.gov/app/details/SERIALSET-07713_00_00-004-0571-0000
House of Representatives, Congress. H. Doc. 66-571 - Geology of the igneous rocks of Essex County, Massachusetts, by Charles H. Clapp. [U.S. Geological Survey Bulletin 707.]. U.S. Government Printing Office, (1 Jan 1920), https://www.govinfo.gov/app/details/SERIALSET-07713_00_00-004-0571-0000
House of Representatives, Congress, Geology of the igneous rocks of Essex County, Massachusetts, by Charles H. Clapp. [U.S. Geological Survey Bulletin 707.], GovInfo, (January 1, 1920), https://www.govinfo.gov/app/details/SERIALSET-07713_00_00-004-0571-0000