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1Boekdoor Shapero, Albert“…United States. Office of the Director of Defense Research and Engineering…”
Gepubliceerd in 1965
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2Boekdoor Douglass, Joseph D.“…United States. Office of the Director of Defense Research and Engineering…”
Gepubliceerd in 1976
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3Overheidsdocument Conferentie aktenGepubliceerd in 1964“…United States. Office of the Director of Defense Research and Engineering…”