Author talk:Ralph Morrell Heintz
Latest comment: 6 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)