As a "West Coast" photographer, I am indeed familiar with the photography of Renger-Patzsch. His work is often mentioned in conversations of Edward Weston, as they photographed with a similar purpose during the same period.
In 1970 my father, Donald Ross, visited Renger-Patzsch's widow and daughter at the family home in Wamel with the hope of purchasing a selection of photographs. He was successful in purchasing Renger-Patzsch's last exhibition in its entirety (28 prints) from Frau Renger. He gifted the collection to the Friends of Photography in Carmel, who subsequently sold the collection to the University of California, Riverside.
Good that you found the information you sought by visiting this forum. I look forward to your book when it becomes available.
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