| E. A. Schwerdtfeger & Co, Berlin (publisher) Ein kräftiger Zusammenstoss [A powerful collision] 1914 Gelatin silver print, postcard 8.7 x 13.7 cm (3 7/16 x 5 3/8 ins) Metropolitan Museum of Art Twentieth-Century Photography Fund, 2010, Accession Number: 2010.296 LL/16996
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