Samuel Heaton mathematics notebook (HC.MC.975.11.052), Quaker & Special Collections, Haverford College, Haverford, PA.
Samuel Heaton mathematics notebook (HC.MC.975.11.052), Quaker & Special Collections, Haverford College, Haverford, PA. https://archives.tricolib.brynmawr.edu//repositories/5/resources/1421 Accessed April 23, 2024.
