I have some information for you. I was at the Morrison County Courthouse today. I found a Dura COSTER in the death register. Date of death is July 13, 1918. I did not find a CORBIN but I think the info in the death listing may be what you want. There is no specific certificate at the courthouse, just a line with info. The gals at the courthouse said that if you request the certificate from the MN historical society, it may just be the following info typed on to the certificate or it could be the hand written death info. They can't be sure. What I have is from
Book D, Pg 201, Line 120:

Dura Coster, male, white, married,
date of birth: Aug. 9, 1842
date of death: July 13, 1918
Age 75 years, 11 months, 4 days
Retired farmer
Cause of death: prostate hypertrophy, general prolapse - old age
Birth place: New York (this was written across the columns for deceased, mother and father)
Father: Isaac Coster
Mother: Harriet Medbury
Physician: N. Durmont
Undertaker D.K. Harting

I hope MEDBURY is the name you are looking for. No wife is listed in the death information. If you would like, I may be able to search for an obit from the local paper if you need more info.

Hope this helps!
Stephanie