File:Kochherd zur Heizung mit Kohle und Gas. In, R.Gaertner, Chemisch-technisches repertorium, Band 29, 1891, Seite 339.JPG - Wikimedia Commons
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Die Naturwissenschaften in ihrer Entwicklung und in ihrem Zusammenhange, 3. Band, by Friedrich Dannemann, a Project Gutenberg eBook.
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