An difríocht idir athruithe ar: "Roy J. Plunkett"
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== Naisc sheachtracha ==
*Center
* Bohning, James J. (27 May 1986). Roy J. Plunkett, Transcripts of Interviews Conducted by James J. Bohning in New York City and Philadelphia on 14 April and 27 May 1986. https://oh.sciencehistory.org/sites/default/files/plunkett_rj_0037_suppl.pdf]
[[Catagóir:Básanna i 1994]]
[[Catagóir:Daoine a rugadh i 1910]]
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