Gummere's Rule for Calculating an Eclipse of the Sun (HCS.001.043) Quaker and Special Collections, Haverford College, Haverford, PA.
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Gummere's Rule for Calculating an Eclipse of the Sun (HCS.001.043) Quaker and Special Collections, Haverford College, Haverford, PA. https://archives.tricolib.brynmawr.edu//repositories/5/resources/11720 Accessed April 15, 2025.
