Douglas, C. A. & Booker, R. L. Visual Range: Concepts, Instrumental Determination, and Aviation Applications, report, June 1977; (https://digital.library.unt.edu/ark:/67531/metadc13191/m1/2/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .

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