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General Research Division, The New York Public Library. "Polished surface of specimen of biotite gneiss, with included fragment of amphibolite partially drawn out into a "tail." West side of Jackfish Lake, Pipestone route" The New York Public Library Digital Collections. 1888. https://qa-digitalcollections.nypl.org/items/7ab59580-f90c-013c-6c36-0242ac110002
General Research Division, The New York Public Library. "Polished surface of specimen of biotite gneiss, with included fragment of amphibolite partially drawn out into a "tail." West side of Jackfish Lake, Pipestone route" New York Public Library Digital Collections. Accessed November 22, 2024. https://qa-digitalcollections.nypl.org/items/7ab59580-f90c-013c-6c36-0242ac110002
General Research Division, The New York Public Library. (1888). Polished surface of specimen of biotite gneiss, with included fragment of amphibolite partially drawn out into a "tail." West side of Jackfish Lake, Pipestone route Retrieved from https://qa-digitalcollections.nypl.org/items/7ab59580-f90c-013c-6c36-0242ac110002
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/7ab59580-f90c-013c-6c36-0242ac110002 | title=
(still image)
Polished surface of specimen of biotite gneiss, with included fragment of amphibolite partially drawn out into a "tail." West side of Jackfish Lake, Pipestone route, (1888)
|author=Digital Collections, The New York Public Library |accessdate=November 22, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>