直升机行动 (Chinese Wikipedia)

Analysis of information sources in references of the Wikipedia article "直升机行动" in Chinese language version.

refsWebsite

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1web.archive.org

1^st place

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1vietnam-war.info

low place

low place

doi.org

dx.doi.org

ARMY CENTER OF MILITARY HISTORY WASHINGTON DC. Anzio Beachhead, 22 January - 25 May 1944. Fort Belvoir, VA. 1990-01-01.

vietnam-war.info

Vietnam War - The Vietnam War. （原始内容存档于2011-05-25）.

web.archive.org

Vietnam War - The Vietnam War. （原始内容存档于2011-05-25）.

youtube.com

YouTube上的Battlefield Viet Nam Episode 5 "The Undeclared War" PBS.