The Minnesota Legislative Manual, 1872 has a typo and lists his first initial as A.
The Minnesota Legislative Manual, 1872 lists A.M. Cook as representing District 37 in the list on p. 106. However they list Reishus in the statistical list on p. 152. Toensing only lists O.S. Reishus. The Minnesota Journal of the House, 1872 will need to be checked to determine if Cook ever served.
He moved to Wisconsin in 1843 with his parents when he was two weeks old. He came to Fillmore County, Minnesota in 1854 and settled on a farm in Yellow Medicine County, Minnesota in 1870.
He helped organize Vineland District No. 1, the first school district in Sandnes Township in 1872.
He ran a grain elevator, an abstract office, and farmed. He taught school in Fillmore County, Minnesota for four years. He was in the drug business for a time.
He was elected to the Minnesota Legislature on an Independent ticket.
He is mentioned in the histories of Yellow Medicine County. He was elected, without campaigning I believe, as a non-partisan, but worked for the Republican Caucus and appears at Republican meetings in later years. (Lars Harrisville, a relative)
Toensing lists his city of residence as Havanger. The Minnesota Legislative Manual, 1872 lists his post office as Havanger. His relative says his city of residence was Stavanger.
Birth county, birth place, April birth date, family data, party affiliation, college, occupations, other government service, and religion provided by a relative. Another relative says he was born in May. Photo of the footstone for Ole S. Reishus lists April 6, 1843.