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There is a page named "File:Spectre electrique du Chlorure de Gallium.jpeg" on Wikipedia
Spectre electrique du Chlorure de Gallium, with a comparison spectra. Sur un nouveau metal, le gallium. Paris : s.n., 1877. ( ) Author Lecoq de Boisbaudran...(1,129 × 750 (66 KB)) - 21:07, 28 December 2019
