Dear Wynn Strahle...
My sister found your posting on this website. I have changed my email address as you see. I am not a pro on family history but do have a few things and did visit Manning, IA to see the Claussen graves. I also have pictures of those two.

Wiebke Claussen (nee Thomsen) was born in Lunden, Germany May 18,1820. In 1845 she was married to Peter Claussen in Schleswig-Holstein.. In 1882 she came to America and settled in Crawford Co.

Peter Claussen born Mar. 24, 1821 in Schleswig-Holstein. Died Oct. 25, 1888.
Son: Peter Dethlef Claussen born Nov. 30 1849 in Luson, Schleswig-Holstein. He died Dec. 22, 1912 in Council bluffs, IA