-  Temple Records Index Bureau of the Church of Jesus Christ of Latter-day Saints, Nauvoo Temple Endowment Register, 10 December 1845 to 8 February 1846 (Salt Lake City: Church of Jesus Christ of Latter-day Saints, 1974), 241, Mary Southworth. Vera Southworth Fife, “A Sketch of the Life of Mary Byington,” in Brigham Glen Marble, Mormon Marbles Roots and Branches, pp. 45, 84, CHL. “Family Tree,” database, FamilySearch (https://familysearch.org, accessed Apr. 2016), Mary Byington LKVY-1KV . 1880 U.S. census, Brigham City, Box Elder Co., Utah Territory, ED 4, p. 8D, Mary Southworth, NARA. “Utah Death Registers, 1847–1966,” Mary Southworth, Feb. 15, 1899; database and images Ancestry.com (http://ancestry.com, accessed May 2013); citing series 21866, from Utah Department of Health, Bureau of Vital Statistics, Utah State Archives and Records Service, Salt Lake City. Find a Grave, database and images (http://findagrave.com, accessed May 2013), memorial no. 14075566, Mary Byington Southworth; Brigham City Cemetery, Brigham City, UT.