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1Livropor Shapero, Albert“…United States. Office of the Director of Defense Research and Engineering…”
Publicado em 1965
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2Livropor Douglass, Joseph D.“…United States. Office of the Director of Defense Research and Engineering…”
Publicado em 1976
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3Documento Governamental Anais de CongressoPublicado em 1964“…United States. Office of the Director of Defense Research and Engineering…”