Ellicott used to survey the 31st latitude David Bates Douglass, son-in-law History of Washington, D.C. Notes References Bedini, S. "Andrew Ellicott, Surveyor of the Wilderness", Surveying and Mapping (June 1976): 113–135. Crim, R. D.: Andrew Ellicott and the North Georgia Boundary of 1811, paper submitted to the ACSM/FIG Conference in April 2002 in Washington, D.C. Retrieved August 10, 2005. Davis, N.M.: Andrew Ellicott: Astronomer, mathematician, surveyor , Lewis and Clark Trail Heritage Foundation, Philadelphia Chapter, 2001. Retrieved August 10, 2005. Davis, N.M.: Andrew Ellicott and Meriwether Lewis, Discovering Lewis & Clark, May 2005. Retrieved August 10, 2005. Nolan, A. (revised by Kerwin, P.), Andrew Ellicott: An Register of His Papers in the Library of Congress, Manuscript Division, Library of Congress, Washington, D.C. 2003, in official website of U.S. Library of Congress Retrieved February 13, 2009. Spies, G.C.: Major Andrew Ellicott, Esq. — Colonial American Astronomical Surveyor, Patriot, Cartographer, Legislator, Scientific Instrument Maker, Boundary Commissioner & Professor of Mathematics, presented at the FIG XXII International Congress, Washington, D.C., April 19–26, 2002, in website of International Federation of Surveyors, FIG Retrieved February 13, 2009. Toscano, P.: Book Review: Andrew Ellicott, His Life and Letters, Professional Surveyor Magazine 17(6), September 1996. Further reading External links was one of Andrew Ellicott's teachers. . . Some information of the Florida-Alabama border (Archived 2009-10-25). Article and portrait at "Discovering Lewis & Clark" Andrew Ellicott: Early America's Preeminent Surveyor by Chas Langelan Image of Andrew Ellicott, 1809 by painter Jacob Eichholtz of Lancaster, Pennsylvania. A surveying instrument of Andrew Ellicott, with images. Ellicott's Mound historical marker History of Washington, D.C. History of Lancaster, Pennsylvania American surveyors People from Bucks County, Pennsylvania People from Lancaster, Pennsylvania 1754 births 1820 deaths American Quakers