I actually met the man in the late sixties or early 70s at his home in Fort Collins, Colorado. He was a teacher at Colorado State University. He collected and wrote about single shot rifles in the American Rifleman you refer to. John Dutcher had met the gentleman sometime earlier, and asked if I would like to meet him. He was most cordial, and invited us into his home. We talked single shot rifles for a considerable time. He was very knowledgeable and still owned a number of very fine rifles, some of which he had hunted with and had purchased new. Men like him are unfortunately  few and far between. Soon after, I made copies of his writings and gave them to like minded friends, as I had The Rifleman going back to the first in 1923. A very good memory thanks to a very good friend.

The For Sale sections will Break Your Heart.

Every American Rifleman, Arms and the Man and Shooting and Fishing magazine before 1942:

(You need to Login or Register to view media files and links)

I "think" they should be in the public domain by now. 
I agree it would be wonderful if they were assembled into a downloadable file to enjoy.  I would also appreciate the same thing on Frank De Haas, Henry Beverage and others.