All of Miller's content predates 1923 and is out of copyright. The Introduction and any other content created by me is copyrighted and licensed by Oregonguidespublishing llc under a Creative Commons Attribution-ShareAlike 3.0 Unported License. The short version: If it's non-commercial, you can do pretty much anything you like with my material. You can copy it and pass it along without asking me provided you credit oregonguidespublishing.com as the source. You can alter, transform or build it into your own work provided the result is distributed under the same license as this.
If you have a commercial use in mind, contact me and I'm sure we can work something out.