Author talk:Ralph Morrell Heintz
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Latest comment: 7 months ago by Qq1122qq in topic Material on Heintz
Material on Heintz
[edit]https://oac.cdlib.org/findaid/ark:/13030/tf5k4004wb/
https://ethw.org/Heintz_and_Kaufman
... and more on googling. Qq1122qq (talk) 14:07, 29 April 2024 (UTC)