Condign volumes 1 to 3

Internet Archive · 258 pages · text by OCR, confidence 98%

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Figure 1: Orbital period of a satellite versus its average height above the Earth (U) Figure 2: Photograph of the descent of Skylab 1 over Australia on 11 July 1979 (U)

Cited by

Project Condign: the MoD's secret study of Unidentified Aerial Phenomena in the UK Air Defence Region 2000
UK Ministry of Defence UFO Files Released to The National Archives, 2008 to 2013 2008

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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 (mean confidence 98%); expect the odd misread word. 258 pages are in the text index: search them above, or from the library's search.