You can type in:
www.lib.ndsu.nodak.eduOR
library.ndsu.edu
Their Main Page, will probably state the following:
WE'VE MOVED.
Scroll down and on the left side of the page you will see the following:
GENEALOGY & BIOGRAPHY - click on it.
Now you will have the following page:
NORTH DAKOTA NATURALIZATIONS RECORDS INDEX.
Type in the last name to get better results.
The website address has changed since I posted the original message. You an always type in Institute of Regional Studies, Fargo and get to the website.
Their phone number is 701-231-8914 and the staff people are very knowledgable. Good Luck in your research!