Rudolph Polk (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Rudolph Polk" in English language version.

refsWebsite

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1familysearch.org

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1books.google.com

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books.google.com

Gregor Piatigorsky: The Life and Career of the Virtuoso Cellist, by Terry King, McFarland & Company (2010), pg. 342, note 40; OCLC 656359759

familysearch.org

"Polk, Rudolf", WWI Draft Registration Card, 1917–1918

worldcat.org

Gregor Piatigorsky: The Life and Career of the Virtuoso Cellist, by Terry King, McFarland & Company (2010), pg. 342, note 40; OCLC 656359759