- [S890] Ancestry.com, U.S., School Yearbooks, 1900-1990, (Name: Name: Ancestry.com Operations, Inc.; Location: Provo, UT, USA; Date: 2010;;), "U.S., School Yearbooks, 1880-2012"; Year: 1953.
- [S12688] Ancestry.com, USA, Einberufungskarten aus der Zeit des Koreakriegs, 1948–1959, (Name: Ancestry.com Operations, Inc.; Location: Lehi, UT, USA; Date: 2024;), National Archives at St. Louis; St. Louis, Missouri; Record Group: Records of the Selective Service System, 1926–1975; Record Group Number: 147; Series: Post-WWII through Vietnam Era Selective Service Records, Hawaii; Series Number: 147-76A-0768.
Record for Libert K. Landgraf
https://search.ancestry.com/cgi-bin/sse.dll?db=62234&h=968054&indiv=try
- [S9014] Ancestry.com, Heiratsindex von Newspapers.com, 1800s - 2020, (Name: Ancestry.com Operations Inc; Location: Lehi, UT, USA; Date: 2020;), Honolulu Star-Bulletin; Publication Date: 18/ Sep/ 1953; Publication Place: Honolulu, Hawaii, USA; URL: https://www.newspapers.com/image/280433821/?article=68516824-b703-42f1-b8c5-4f50cbbcffb3&focus=0.021757081,0.25118402,0.15141714,0.5307444&xid=3398.
Record for Libert K. Landgraf
https://search.ancestry.com/cgi-bin/sse.dll?db=62116&h=98777667&indiv=try
- [S1634] Newspapers.com - Honolulu Star-Bulletin - 18 Sep 1953 - Page 13, (Name: Name: Honolulu Star-Bulletin; Location: Honolulu, Honolulu, Hawaii, United States of America; Date: 18 Sep 1953;;), Marriage Libert Landgraf-Harriet Matilda Niaulani Robertson 1953 18 Sep 1953.
https://www.newspapers.com/clip/28105537/marriage_libert_landgrafharriet/?xid=637
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