Ommund (Omen) Swenson's birth/baptismal record - son of Ole Svendsen and Birthe Christensdatter. 2nd entry:
Aust-Agder County, Barbu Parish, Tromøy Kommune, Minister's book (1837-1846), 1845, page 42.
http://www.arkivverket.no/URN:kb_read?idx_kildeid=827&id...

Here is a great site for researching Norwegians in Manitowoc County, WI.
http://www.2manitowoc.com

Manitowoc-skogen book that you can download (.pdf file). It includes information about the Swensons:
http://www.rbjerke.net/books/manitowoc-skogen