Photos used by publications like rocky mountain news are copyrighted.
Perhaps it would be a good idea for you write to the editor and ask for permission to use the photos. Identify yourself, the purpose of your website and/as use of the requested copyright materials.
Usually they will grant permission (e.g.the photos you use would say "Used by Permission of the Rocky Mountain News").
Sometimes, especially in the case of free-lance photographers, the copyright is retained by the photographer, other times sold with the picture to the publication.
Hope this helps!