| N.V. Bogaevskii Syr Darya oblast. Ilan Utinsk Gorge. Cliff formations of Ilan Utinsk Gorge [Turkestan Album] 1871-1872 Albumen print Library of Congress, Prints and Photographs Division LLC-DIG-ppmsca-09947-00042, digital file from Part 1, vol. 1, pl. 17, no. 42 LL/77250
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