Does anyone know how I can get a copy of the American Rifleman magazine's tests of the Winchester Model 21?

The magazine tells me that their archives do not go that far back. So there is no joy there.

Is there any other place that can offer scanned copies of the tests?

Apparently these were the second batch of tests of the Model 21. The first had been done by Winchester in the 1930s. The American Rifleman tests were like a replay and somewhat more "scientific".