Prof. Graham BELL, "On Methods of Preparing Selenium and other Substances for Photophonic Experiments",
Proceedings of the
Royal Society of London, Nov. 25 1880, p.72.
Les tables publicitaires brevetées par Plessner aux Etats-Unis -1875)
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Prof. Graham BELL, "On Methods of Preparing Selenium and other Substances for Photophonic Experiments",