I haven't read them yet but they get good reviews on Amazon, especially for stories written almost a century ago. Many of them are available, free, on Kindle and Nook. Also, both Kindle and Nook have "The Complete Works of Joseph Altsheler" for three bucks. If you end up enjoying his writing, you might want to try the complete works version. Supposedly, it has been optimized for an e-reader.
Thanks for mentioning his books.
Jeff