No difficult task to reach any of these fine authors. Just use your mouse and click on the name for their address. They will love to hear from you and you may find their books listed as well.
Ever been to Yellowstone National Park? If not, give a look at this site: http://www.photoshow.com/watch/Ee9WX8Ji
My ideas come from discussions with my peers, suggestions from my readers, and 80 years of listening.