"United States Census, 1840," index only, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XHYS-JYB : accessed 14 Oct 2014), John Sibley, Hartland, Somerset, Maine; citing p. 247, NARA microfilm publication M704, roll 151, National Archives and Records Administration, Washington D.C.; FHL microfilm 0009708.
1840 U.S. census, Somerset County, Maine, Hartland, page 247 (stamped [Hartland begins at 244)], line 28, John Sibley; NARA microfilm publication M704, roll 151 (Maine, Volume 7, 68-291 Somerset County); digital images, Internet archive.org (accessed 2014). Note: Eldest male as ae 50-60; eldest female, 60-70; one other male in the home, ae 15-20; one other female, ae 5-10.