Rockport Granite Company quarries, Rockport, Essex Co., Massachusetts, USA

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.

Brayley, Arthur W. (1913): History of the Granite Industry of New England.