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General Research Division, The New York Public Library. "Angular and lenticular fragments of hornblende schist similar to that of the Keewatin series, included in Laurentian gneiss, on island off S.E. shore of Lake of the Woods, three-quarters of a mile north of 49th parallel. The flow or "pulled" structure is in the field very pronounced, the fragments being arranged in streams" The New York Public Library Digital Collections. 1887. https://old-digitalcollections.nypl.org/items/d84389d0-0991-013d-8ecf-0242ac110002
General Research Division, The New York Public Library. "Angular and lenticular fragments of hornblende schist similar to that of the Keewatin series, included in Laurentian gneiss, on island off S.E. shore of Lake of the Woods, three-quarters of a mile north of 49th parallel. The flow or "pulled" structure is in the field very pronounced, the fragments being arranged in streams" New York Public Library Digital Collections. Accessed September 26, 2026. https://old-digitalcollections.nypl.org/items/d84389d0-0991-013d-8ecf-0242ac110002
General Research Division, The New York Public Library. (1887). Angular and lenticular fragments of hornblende schist similar to that of the Keewatin series, included in Laurentian gneiss, on island off S.E. shore of Lake of the Woods, three-quarters of a mile north of 49th parallel. The flow or "pulled" structure is in the field very pronounced, the fragments being arranged in streams Retrieved from https://old-digitalcollections.nypl.org/items/d84389d0-0991-013d-8ecf-0242ac110002
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/d84389d0-0991-013d-8ecf-0242ac110002 | title=
(still image)
Angular and lenticular fragments of hornblende schist similar to that of the Keewatin series, included in Laurentian gneiss, on island off S.E. shore of Lake of the Woods, three-quarters of a mile north of 49th parallel. The flow or "pulled" structure is in the field very pronounced, the fragments being arranged in streams, (1887)|author=Digital Collections, The New York Public Library |accessdate=September 26, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>