"United States, Veterans Administration Master Index, 1917-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:WSXB-SCPZ : 23 October 2019), Palmer Ole Peterson, 2 May 1919; citing Military Service, NARA microfilm publication 76193916 (St. Louis: National Archives and Records Administration, 1985), various roll numbers.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VY4N-ZVH : 28 February 2020), Palmer O Peterson, Bonners Ferry, Bonners Ferry Election Precinct, Boundary, Idaho, United States; citing enumeration district (ED) 11-2, sheet 2A, line 10, family 35, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 741.
"United States World War II Draft Registration Cards, 1942," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:QVJT-21RG : 20 January 2021), Palmer Ole Peterson, 1942; citing NARA microfilm publication M1936, M1937, M1939, M1951, M1962, M1964, M1986, M2090, and M2097 (Washington D.C.: National Archives and Records Administration, n.d.).