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- [S0008] Alle Friezen, (www.allefriezen.nl), Bevolkingsregister 1922 - 1939, archiefnummer 1002, Bevolkingsregister 1922 - 1939, inventarisnummer 4969 Gemeente: Leeuwarden Periode: 1922-1939.
- [S0047] Familysearch, (www.familysearch.org), "United States World War II Army Enlistment Records, 1938-1946," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:K8GH-D3D : 5 December 2014), Auke A Bul, enlisted 31 Aug 1942, Grand Rapids, Michigan, United States; citing "Electronic Army Serial Number Merged File, ca. 1938-1946," database, The National Archives: Access to Archival Databases (AAD) (http://aad.archives.gov : National Archives and Records Administration, 2002); NARA NAID 1263923, National Archives at College Park, Maryland.
- [S0047] Familysearch, (www.familysearch.org), "Texas Death Index, 1964-1998," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JVKQ-T3V : 5 December 2014), Auke Alexander Bul, Dallas, Texas, United States; citing Department of State Health Services, Austin.
- [S0008] Alle Friezen, (www.allefriezen.nl), Huwelijksregister 1919, archiefnummer 1002, Gemeentebestuur van Leeuwarden 1811-1941, inventarisnummer 3644, aktenummer 271 Gemeente: Leeuwarden Periode: 1919.
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