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March 11, 2015 Peet Fetsch Added Ergebnisse der in dem Atlantischen Ocean von Mitte Juli bis Anfang November 1889 ausgeführten Plankton-Expedition der Humboldt-Stiftung. to the list.
March 10, 2015 Peet Fetsch Added Elements of physiological psychology to the list.
September 30, 2014 Peet Fetsch Added Dante and the early astronomers to the list.
September 29, 2014 Peet Fetsch Added The principles of light and color to the list.
September 29, 2014 Peet Fetsch Added The principles of light and color to the list.