Atelier Robertson (1927–1933) :: Hertha Feist. From a group of four dance studies, Berlin, ca. 1928. Each with the photographer’s studio stamp and handwritten annotations in pencil on the reverse. | src Ostlich 15th Photo Auction(11-2016)Hertha Feist. Der Künstlerische Tanz (Eckstein) card # 86 | src Virtual History
Stephanie Ludwig-Held ~Atelier Veritas (Munich) :: Clotilde von Derp-Sacharoff. From Der Kunstlerische Tanz Unserer Zeit[The Artistic Dance of Our Time] by Hermann and Marianne Aubel. Published 1928. | src Artblart
Hugo Erfurth (Dresden) :: Dancer Clotilde von Derp-Sacharoff. From Der Kunstlerische Tanz Unserer Zeit p. 19. Published 1928. | src Marcus Bunyan (Artblart)
Minya Diez-Dührkoop (Hamburg) :: Dancer Clotilde von Derp-Sacharoff. From Der Kunstlerische Tanz Unserer Zeit [The Artistic Dance of Our Time] p. 19. Published 1928. | src Marcus Bunyan
RudolfDührkoop & Minya Diez-Dührkoop:: Porträt von Clotilde von Derp, 20.07.1917. | src Wien Museum