My friend in Minneapolis is now in Florida for the winter. She won't return until Mar/Apr.
Here is a link to researchers in Minneapolis who can get the information quicker, but they charge fees. They should be able to get Eugene's documentation quickly since the Minnesota Historical Society indicated that they have that information on the premises.
"More specifically, we have a variety of records from the State Board of Medical Examiners/Board of Medical Practitioners. These records go back as far as the late 1800s and include Registers of Medical Practitioners and License Application Records."
Reference Librarian http://sites.mnhs.org/library/content/independent-researcher...