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Books about Olsdatter:
The Ulvestad family: Descendants and other relatives of Jorgen Jorgenson Ulvestad and his wife Gitlaug Olsdatter... by Barbara Barsness Swedenburg (1986)
The family of Askild Michelsen Komperud (1762-1846) and Berta Maria Olsdatter (1799-1890) ... Nordre Land, Oppland... by Lavon Elvod Davison (1994)
The Everson family record : Norway, America, Canada, 1812-1998: Ancestors and descendants of Knud (1812-1887)... by James O Gunderson (1998)
Johannes og hans hustru Guruanna =: Johannes and his wife Guruanna : a book about the families and the heritage... by Darrell L Trygstad (2001)
The Norwegian ancestry of Ever Christensen and his wife Nelia Olsdatter Brekka by Marion A. Gunderson (1987)
Helgeson family history: Descendants of Ole Helgeson Brevig and Ingeborg Olsdatter Bjorkerud by Eunice Helgeson (1984)
Descendants of Jens Olsen Winjum (1811-1888) and Eli Olsdatter Prestegaarde (1813-1898) by Orel R Winjum (1972)
Wiki information Olsdatter:
Tora Olsdatter was the mother of Knut Hamsun.