| Frantisek Drtikol Coal mines in Kladno 1907-1909 Gelatin silver print, on postcard 11.5 x 8.2 cm Bassenge Photography Auctions Courtesy of Bassenge, Berlin (Photography, Dec 2, 2009, Sale: 94, Lot: 4176) LL/33533 Photographer's blindstamp in lower right corner.
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