Apparently the Master wrote quite a few stories for the Scouting magazine "Boy's Life".
Googling "boys life archive" will reveal some of the stories, at least. Some of the Boy's life stories have been reprinted elsewhere, but I found one, maybe two that I hadn't read before.
It's a PITA to arrange the whole story, as one has to scroll through pages of a particular issue (hopefully the one where the story starts), and then find where the story jumps to in that issue. Then on to the next issue, and repeat. Seems like most stories have multiple jumps within a single issue of the mag, and go for about 3 sequential issues.
I suggest starting a folder with story title, then adding to it with sequentially numbered links to the sequential pages (in the mag) of a given story, as one come on them within the issue(s) of the magazine.
A bit of a bother, but some seldom-seen stories there.
Good luck!