I also want to add that just like when you found a breakthrough in a print secondary work, the rules of genealogy still apply to Internet secondary sources. I will be writing away for the Nebraska Death Certificate of Sarah Ann (Glenn) Morrow to corroborate what I found. I already had her marriage record at Obion County, Tennessee Marriage Records 1824-1877 compiled by Grace Dietzel Gary and Carolyn West Stricklin (Union City, TN, 1978), p. 32. Her husband, William Lindsey Morrow's birth I also already had from Bible records as recorded in “Pioneers of the Six Bulls: The Newton County, Missouri Saga”, Volume VI, Pioneer Families, pp. 30-1, compiled by Larry A. James (1982). I had Sarah's parents in censuses as well in 1850, 1860 and 1870. So, this useful clue is just that: a clue to further research. I can now efficiently jump back to Smith County, Tennessee and look for primary records there.