Jack,
I saw that in the index of articles. Page A is the front cover - there is just a picture there, actually of a Sportsman. There are answers to a couple of questions on '47 Wagons in that issue about tail lights, fenders, and mats, but nothing on tires.
The only information I have about '47 Wagon wheels is from the V-8 Club's '41-'48 Ford Book, which states that standard wheels on the wagon were 600-16, 6-ply and that an option was 650-16, 6 ply. No mention that 15" were an option.
If you don't have it, the 41-48 Book is an excellent reference, available on the Early Ford V-8 Club's website.
Ken