Booklet "The Electric Spark" by William Otis Sawtelle. Reprint from the Astrophysical Journal, Vol. XLII, No.2 September 1915

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“Booklet "The Electric Spark" by William Otis Sawtelle. Reprint from the Astrophysical Journal, Vol. XLII, No.2 September 1915,” Islesford Historical Society, accessed April 4, 2025, https://ihs.digitalarchive.us/items/show/469.Item 2146

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