Thür Georg (1846-1924), Rheinische Friedrich-Wilhelms-Universität, Bonn. Geological-Paleontological Institute (1909-1911): Floor plan Earth's floor 1: 100. Lithograph colored on the cardboard, 45.4 x 65.9 cm (including scan edges) Thür Georg (1846-1924): Rheinische Friedrich-Wilhelms-Universität Bonn. Geologisch-Paläontologisches Institut

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