found:NUCMC data from Library of Congress Manuscript Division for Leavitt, J. Family papers, 1812-1901(George Grennell, Jr.; b. 1786; d. 1877; correspondent)
found:Bio. dir. U.S. Cong., 1989(Grennell, George; grad. Dartmouth 1808; attorney; memb. Mass. state Senate, 1825-27; U.S. rep. from Mass., 1829-39; pres. Troy and Greenfield Railroad; b. Greenfield, Mass., Dec. 25, 1786; d. Greenfield, Nov. 19, 1877)
found:MWA/NAIP files, Apr. 12, 2013(hdg.: Grennell, George, 1786-1877; variants: G. Grennell; Geo. Grennell)