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USA | |
| Gleba, Peter P. (2008) Massachusetts Mineral and Fossil Localities. Kreueger Enterprises, Inc. |
| Sears, JH, 1905, Geology of Essex County, Mass. |
| Dennen, W. H. 1992, Bedrock geologic map of the Gloucester and Rockport Quadrangles, Essex County, Massachusetts |
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| Gleba, Peter P. (2008) Massachusetts Mineral and Fossil Localities. Kreueger Enterprises, Inc. |
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| Sears, JH, 1905, Geology of Essex County, Mass. |
| Alfred Lane (1890) Proceedings of the Boston Society of Natural History, Volume 24 pp 91-95 |
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| Sears, John Henry (1905): The Physical Geography, Geology, Mineralogy and Paleontology of Essex County |
| Gleba, Peter P. (2008) Massachusetts Mineral and Fossil Localities. Kreueger Enterprises, Inc. |
| Dale, T. N. (1910). Supplementary Notes on the Commercial Granites of New England (in Contributions to Economic Geology, USGS Bulletin 470). |
| Dale, Thomas Nelson (1908): The Chief Commercial Granites of MA, NH, and RI (USGS Bulletin 354). |
| (1917) Geology of Massachusetts and Rhode Island. Bulletin Vol. 597. US Geological Survey doi:10.3133/b597 |