北緯41度線 (Chinese Wikipedia)

Analysis of information sources in references of the Wikipedia article "北緯41度線" in Chinese language version.

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navy.mil

Graff, Bill. Sentinels at the Northern Border (pdf). Unearthing New Jersey Vol. 2, No. 2. New Jersey Geological Survey. Summer 2006 [2020-07-16]. （原始内容存档 (PDF)于2020-07-26）.

Boundaries and Charters of Virginia. www.virginiaplaces.org. [2020-07-16]. （原始内容存档于2020-07-12）.

存档副本. [2020-07-16]. （原始内容存档于2017-07-18）.
Boundaries and Charters of Virginia. www.virginiaplaces.org. [2020-07-16]. （原始内容存档于2020-07-12）.
Graff, Bill. Sentinels at the Northern Border (pdf). Unearthing New Jersey Vol. 2, No. 2. New Jersey Geological Survey. Summer 2006 [2020-07-16]. （原始内容存档 (PDF)于2020-07-26）.