What it's used for here
Blue Book's own short history of its predecessors: Project Sign inaugurated under AMC in early 1948, renamed Grudge on 16 December 1948; the Sign report of February 1949 covering the first 273 incidents; the Grudge report of August 1949 analysing 244 cases.
Our copy
Research copy, for editors and curators. The work is the publisher's, so readers are sent to it. We keep this copy so the citation can be checked if the page changes or goes.
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Cited by on this site 3 records
Cite it
U.S. Air Force, Project Blue Book (n.d.). Project Blue Book (history of the Air Force UFO projects). https://www.theblackvault.com/casefiles/wp-content/uploads/2018/01/historyproject.pdf
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title = {Project Blue Book (history of the Air Force UFO projects)},
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. “Project Blue Book (history of the Air Force UFO projects).” .