Lives of the governors of Minnesota,
This Minnesota Historical Society publication provides biographical chapters on all Minnesota's territorial and state governors from Alexander Ramsey through John Albert Johnson. The author, James Baker, was a former Secretary of State who played an active role in state politics for many years. Nevertheless, he claims to have written his entries in a non-partisan spirit and brings his years of experience to bear upon the careers and the times he describes. There is a full-page photograph of each governor, and an extensive index.
Also available in digital form on the Library of Congress Web site.