Haldor Topsøe (1842–1935) (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Haldor Topsøe (1842–1935)" in English language version.

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doi.org

Anon (1885). "The Danish Scientific Expedition of 1884 in the Gunboat 'Fylla'". Proceedings of the Royal Geographical Society and Monthly Record of Geography. 7 (3): 177–180. doi:10.2307/1800390. JSTOR 1800390.

jstor.org

Anon (1885). "The Danish Scientific Expedition of 1884 in the Gunboat 'Fylla'". Proceedings of the Royal Geographical Society and Monthly Record of Geography. 7 (3): 177–180. doi:10.2307/1800390. JSTOR 1800390.