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The forces of nature: a popular introduction to the study of physical phenomena
General Research Division, The New York Public Library. "Polar Aurora Borealis observed at Bossekop (Finmark) 19th January 1839. at 7 h. 40 m. p.m." The New York Public Library Digital Collections. 1872. https://qa-digitalcollections.nypl.org/items/f03ef820-c669-013b-9717-0242ac110002
General Research Division, The New York Public Library. "Polar Aurora Borealis observed at Bossekop (Finmark) 19th January 1839. at 7 h. 40 m. p.m." New York Public Library Digital Collections. Accessed November 25, 2024. https://qa-digitalcollections.nypl.org/items/f03ef820-c669-013b-9717-0242ac110002
General Research Division, The New York Public Library. (1872). Polar Aurora Borealis observed at Bossekop (Finmark) 19th January 1839. at 7 h. 40 m. p.m. Retrieved from https://qa-digitalcollections.nypl.org/items/f03ef820-c669-013b-9717-0242ac110002
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/f03ef820-c669-013b-9717-0242ac110002 | title=
(still image)
Polar Aurora Borealis observed at Bossekop (Finmark) 19th January 1839. at 7 h. 40 m. p.m., (1872)
|author=Digital Collections, The New York Public Library |accessdate=November 25, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>