"United States World War I Draft Registration Cards, 1917-1918", database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:K66F-HDQ : 29 December 2021), Joseph Nicholas Trierweiler, 1917-1918.
"United States, Veterans Administration Master Index, 1917-1940", , FamilySearch (https://www.familysearch.org/ark:/61903/1:1:WQTX-HFN2 : Wed Oct 25 12:50:07 UTC 2023), Entry for Joseph Nicolas Trierweiler, 27 Jun 1919.
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