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Campbell 1916, p. 77. Campbell, Mrs. David Allen (1916). The Musical Monitor (Public domain ed.). Mrs. David Allen Campbell, Publisher. Archived from the original on April 28, 2016. Retrieved October 22, 2015.
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Electrical Engineer 1893, p. 591. Electrical Engineer (1893). Electrical Engineer. Vol. XV (Public domain ed.). Electrical Engineer. Archived from the original on May 11, 2016. Retrieved October 22, 2015.