Gustav Adolf Heribert Rau
"German painter Gustav A H Rau was born in 1881 in Frankfurt, Germany.
Rau was friends with, among others Kollmar Worpswede painters.
Gustav A H ...
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Rau passed away in 1957 in Bremen." (https://www.askart.com/artist/Gustav_A_H_Rau/11125256/Gustav_A_H_Rau.aspx, 28.07.23)