Geology, Landscapes, North America, glaciers of the Sierra Nevada
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"Die Gletscher der Sierra Nevada (Nord-Amerika) in der Gegenwart"
The glaciers of the Sierra Nevada at present time (1885)
Zincograph after J.C. Russell (5th Annual Report of the U.S. Geological Survey, Washington, 1885.
This zincograph (the glaciers in 1885 in blue. With a see-through an extra attached tissue paper the immense extent of the glaciers formerly. Probably meaning during ice-age???
From a German publication. Berlin, 1904
Page size: 28,2 x 20 cm (ca. 11.1 x 7.9")