Then you’ll be interested in this note from Mary Bakeman of Park Genealogical Books:
“Our research note for September focuses on adoptions, one of the brick walls faced by many family historians. It reviews the legal issues, as well as some of the other resources that may be of use.
It can be found at http://www.parkbooks.com/Html/res_adpt.html
The set of monthly notes can be found at http://www.parkbooks.com/Html/research.html
You can sign up at the latter page for automatic notification of the monthly notes.
Park Genealogical Books
Specialists in Minnesota and the surrounding area