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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Eagle Harbor Copper Co, and Essex, Middlesex, and Sussex mines, in T 58 N. R. 30 W." The New York Public Library Digital Collections. 1870 - 1879. https://digitalcollections.nypl.org/items/dc0a6010-b5c6-0135-734d-1f14c926ecd2
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Eagle Harbor Copper Co, and Essex, Middlesex, and Sussex mines, in T 58 N. R. 30 W." New York Public Library Digital Collections. Accessed May 8, 2024. https://digitalcollections.nypl.org/items/dc0a6010-b5c6-0135-734d-1f14c926ecd2
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1870 - 1879). Eagle Harbor Copper Co, and Essex, Middlesex, and Sussex mines, in T 58 N. R. 30 W. Retrieved from https://digitalcollections.nypl.org/items/dc0a6010-b5c6-0135-734d-1f14c926ecd2
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/dc0a6010-b5c6-0135-734d-1f14c926ecd2 | title=
(cartographic)
Eagle Harbor Copper Co, and Essex, Middlesex, and Sussex mines, in T 58 N. R. 30 W., (1870 - 1879)
|author=Digital Collections, The New York Public Library |accessdate=May 8, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>