The Rockport Granite Company owned a number of quarries and was in business from 1865 to 1933. At its peak of operation, the company employed more than 800 men.
References
Merrill, George P. (1889): The Collection of Building and Ornamental Stones in the U.S. National Museum, p. 554.
Sears, J. H. (1894): Geological and Mineralogical Notes, No. 9 in Bulletin of the Essex Institute, vol. 26.
Sears, J. H.(1905): The Physical Geography, Geology, Mineralogy and Paleontology of Essex County.
Dale, Thomas Nelson (1908): The Chief Commercial Granites of MA, NH, and RI (USGS Bulletin 354).
Brayley, Arthur W. (1913): History of the Granite Industry of New England.
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