Glenn, Heck, I am full of suggestions!!LOL But,a couple of things. I would request a death certificate from the State of Colorado. Its $15.00 and another $5.00 since you do not know the exact yr. of death. Lots of info there. 2nd. I might try The Delta County Historical Society,251 Meeker St, Delta 81416 / 970.874.8760
Also, I believe this "might" help, since you didn't include this in your other messages. I believe that Merle died in Canon City, Colorado, March 1976. There could be an obit or death certificate info there. I believe you will find Millard Cook at the United States Navy Recruting Station, Philadelphia, Pa. in the 1920 census.His information fits. Who knows where he might have landed from there?
I would go the death certificate route right off, if you can afford the $20.00. Then Delta County. But, they have cemetery records there,so........? That should give you something to work on for a bit.Hope that helps Good Hunting, Frank