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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.
Read from the scan by GLM-OCR; expect the odd misread word.
# UNCLASSIFIED 1. Date 21 June. 1947 Incident # 25 2. Time not stated 3. Location Idaho 4. Name of observer 5. Occupation of observer 6. Address of observer Not stated 7. Place of observation Idaho western sky 8. Number of objects 1 9. Distance of object from observer Not stated 10. Time in sight Not stated 11. Altitude Not stated 12. Spcod Remained immobile 13. Direction of flight Didn't move just seemed to go below the horizon with the rotation of the earth 14. Tactics hovering 15. Sound Not stated 16. Size not stated 17. Color not stated 18. Shape comet-like 19. Odor detected Not stated 20. Apparent construction not stated 21. Exhaust trails Not stated 22. Weather conditions Not stated 23. Effect on clouds conet-like hanging in the western sky 24. Sketches or photographs Not stated 25. Mannor of disappearance 26. Remarks: (Over) seemed to go below the horizon with the rotation of the earth.
Document, cited by the archive. The PDF is mirrored here; the original link is above. The text was read from the page images by GLM-OCR; expect the odd misread word. 62 pages are in the text index: search them above, or from the library's search.