Wildside Press has been working to reissue many of his classic works. Here, then, are four of his action-adventure novels aimed at the Young Adult market (they are quite readable for adults, too):
Cave of Danger
The Fire Trail
If you enjoy this ebook, don't forget to search your favorite ebook store for "Wildside Press Megapack" to see more of the 260+ volumes in this series, covering adventure, historical fiction, mysteries, westerns, ghost stories, science fiction -- and much, much more!