Talk:Proceedings of the Royal Society of London/Volume 60/On the Determination of the Wave-length of Electric Radiation by Diffraction Grating
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 | Proceedings of the Royal Society of London/Volume 60/On the Determination of the Wave-length of Electric Radiation by Diffraction Grating was the featured text for April 2015 (discussion). It was considered among the most complete works available on Wikisource. |