August Sonntag (German Wikipedia)

Analysis of information sources in references of the Wikipedia article "August Sonntag" in German language version.

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3,379^th place

adw-goe.de

Brief von Adolph Cornelius Petersen an Carl Friedrich Gauß, 21. Juni 1851, Gauß-Briefdatenbank.

August Sonntag: Observations on terrestrial magnetism in Mexico Conducted under the direction of Baron von Müller, with notes and illustrations of an examination of the volcano Popocatepetl and its vicinity. Smithsonian Institution, Washington 1860
Isaac Israel Hayes: The Open Polar Sea. Narrative of a Voyage of Discovery in the Schooner „United States“. Hurd and Houghton, New York 1867, S. 10
Hans Hendrik: Memoirs of Hans Hendrik, the Arctic Traveller, Serving under Kane, Hayes, Hall and Nares 1853–1876, Trübner & Co., Ludgate Hill 1878, S. 38f. (englisch)