51st parallel north (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "51st parallel north" in English language version.

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1web.archive.org

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1books.google.com

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archive.org

United States, Bering Sea Tribunal of Arbitration (1892). Fur-seal Arbitration: The Case of the United States before the Tribunal of Arbitration to convene at Paris under the provisions of the treaty between the United States of America and Great Britain, concluded February 29, 1892. United States Government Printing Office. p. 14. OCLC 68198841.

books.google.com

Haycox, Stephen W. (2002). Alaska: An American Colony. University of Washington Press. pp. 1118–1122. ISBN 978-0-295-98249-6.

navy.mil

aa.usno.navy.mil

"Duration of Daylight/Darkness Table for One Year". U.S. Naval Observatory. 2019-09-24. Archived from the original on 2019-10-12. Retrieved 2021-03-10.

web.archive.org

"Duration of Daylight/Darkness Table for One Year". U.S. Naval Observatory. 2019-09-24. Archived from the original on 2019-10-12. Retrieved 2021-03-10.

worldcat.org

search.worldcat.org

United States, Bering Sea Tribunal of Arbitration (1892). Fur-seal Arbitration: The Case of the United States before the Tribunal of Arbitration to convene at Paris under the provisions of the treaty between the United States of America and Great Britain, concluded February 29, 1892. United States Government Printing Office. p. 14. OCLC 68198841.