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Princeton University Library Catalog
Aerial observation [electronic resource].
[S.I.] : [s.n.], 1918.
1 online resource (14 p.), digital, PDF file.
United States. Army. Air Corps
Air Service Bull. No. 27
[on military reconnaissance from balloons and airplanes].
Record is based on bibliographic data in ProQuest U.S. Executive Branch Documents, 1910-1932. Reuse except for individual research requires license from ProQuest, LLC.
Electronic reproduction. [Bethesda, Md.] : ProQuest, 2012. digital, PDF file. ProQuest U.S. Executive Branch Documents, 1910-1932. Mode of access: World Wide Web via ProQuest website.
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