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[[image]] B.S. 22200. Arid gravel hills. General Roca, Río Negro, Argentina. December 2, 1920. [[image]] B.S. 22201. A typical town of northern Patagonia. General Roca, Río Negro, Argentina. December 2, 1920. [[image]] 1431. Exposed end of log of petrified wood projecting from hillside. Near General Roca, Río Negro, Argentina. December 2, 1920.