"... calculated by that ingenious mathematician Andrew Ellicott, Esq ..."--p. [2].
Advertised in the Maryland journal, Baltimore, Sept. 25, 1781.
Electronic text and image data. [Chester, Vt. : Readex, a division of Newsbank, Inc., 2002-2004. Includes files in TIFF, GIF and PDF formats with inclusion of keyword searchable text. (Early American imprints. First series ; no. 17145).