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This US Air Force Project Blue Book case file on Kenneth Arnold's sighting of nine objects near Mount Rainier, Washington, on 24 June 1947 was released through The Black Vault. It contains the Project 10073 record card, which concludes the objects were a mirage, plus Arnold's telegram, questionnaire data and interview notes. It also includes J. Allen Hynek's analysis arguing the objects were closer and slower than Arnold estimated. Other items are David Johnson's sworn statement on a Boise sighting, a Tacoma investigation telegram and news clippings.
“Pendleton”6 pages
$$
\begin{array}{l} 1 ^ {\prime} = \frac {1}{3 4 3 7} \\ 3 ^ {\prime} = \frac {3}{3 4 3 7} \\ \end{array}
$$
10% / mile
5 miles . 1 foot in 1000 feet
Computations in the " Real Case" by Dr. Hynek, 28 u Document, cited by the archive. The PDF is mirrored here; the original link is under it. The text was read from the page images by an OCR model; expect the odd misread word. 62 pages are in the text index: search them above, or from the library's search.