UFO Book:
“Secrets of the Mysterious Valley”
by Christopher O'Brien
A significant part of the book deals with UFO sightings and animal mutilations that have occurred in the San Luis Valley (Colorado and New Mexico) throughout the years:
http://books.google.com/books?id=dP0R_t4rCPgC&printsec=frontcover&dq=&hl=en#v=onepage&q&f=false
The book was published by Adventures Unlimited Press (Kempton, Illinois) in 2007.
(amazon.com image)