"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZ99-SGM : 26 August 2017), Otto Gulden in household of John P Gulden, Cottonwood, Brown, Minnesota, United States; citing enumeration district ED 22, sheet 32C, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,254,616.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MM5Q-WZC : accessed 26 October 2020), Otto B Gulden in household of Caroline Gulden, Belt Township, Cascade, Montana, United States; citing enumeration district (ED) 144, sheet 26B, family 620, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,909.
"Montana, County Marriages, 1865-1950," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:F3Q7-5MD : 21 May 2019), Otto B. Gulden and Lillian Britten, 19 Jul 1913; citing Marriage, Great Falls, Cascade, Montana, various county courthouses, Montana; FHL microfilm 1,940,166.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VB3Y-SCM : 29 May 2020), Otto B Gulden, School District 9 Waltham, Chouteau, Montana, United States; citing enumeration district (ED) 8-9, sheet 1B, line 63, family 19, 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 2216.
"Montana, Chouteau County Records,1876-2011," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QJDL-ZF4Q : 24 May 2014), Otto B Gulden, Death, 11 Apr 1945, Waltham, Choteau, Montana, United States; citing vol. Death certificates no 2326-2650, various offices Chouteau County Courthouse and Museum of the Northern Plains River and Plains Society, Fort Benton; FamilySearch digital folder 005725265.
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