Poor Richard Improved: Being an Almanack and Ephemeris of the Motions of the Sun and Moon; The True Places and Aspects of the Planets; The Rising and Setting of the Sun; Philadelphia: 1768-1791 , 1768-1791

Poor Richard Improved: Being an Almanack and Ephemeris of the Motions of the Sun and Moon; The True Places and Aspects of the Planets; The Rising and Setting of the Sun; Philadelphia: 1768-1791 , 1768-1791, Box: 10. Livezey-Laughlin Family Papers, 1746-1948, SFHL-RG5-271. Friends Historical Library of Swarthmore College. https://archives.tricolib.brynmawr.edu//repositories/7/archival_objects/302584 Accessed February 10, 2025.