"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M8DD-35K : accessed 4 April 2016), William Poulson, Marshall county, part of, Marshall, Virginia, United States; citing family 1389, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
"Missouri Deaths and Burials, 1867-1976," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:FDN9-NJS : accessed 4 April 2016), William Polson, 24 Feb 1887; citing Grant Twp., Harrison, Missouri, reference ; FHL microfilm 1,007,681.
Acknowledgement
This person was created through the import of Polston_Peterson.ged on 16 March 2011. The following data was included in the gedcom. You may wish to edit it for readability.