Aerial navigation : on the problem of guiding aircraft in a fog or by night when there is no visibility
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Aerial navigation : on the problem of guiding aircraft in a fog or by night when there is no visibility, report, January 1922; (https://digital.library.unt.edu/ark:/67531/metadc53657/: accessed July 16, 2025), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.