| Albert Renger-Patzsch Rock transport in Upper Ticino (weathering, erosion, transport) 1960s (early) Gelatin silver print Villa Grisebach Auktionen GmbH - Berlin Auction 271, 31 May 2017, Lot: 2090 LL/76572 German title: Gesteins-Transport im oberen Tessin (Verwitterung, Abtragung, Erosion, Transport).
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