The authors are deeply indebted to the following organizations and personnel without whose dedication and unselfish assistance the completion of this study would not have been possible.

	Members of the United States Air Force Detachment 1 37th Aerospace Rescue and Recovery Squadron, in particular the Commanders, Major Richard Kennard and Major Ron Merino.
	Members of the Pima County Sheriff's Department, in particular Sheriff Clarence Dupnik, Lt. James Rose, Lt. David Starr, Steve Cartwright, and the members of the Special Response Teams.
	University of Arizona Mathematics Department and its computer facilities
	Search and Rescue Council Incorporated
	Arizona Civil Air Patrol
	United States Bureau of Land Management
	United States Customs Service, Air Support Branch, Tucson, Arizona
	Arizona Department of Public Safety, Air Rescue, Tucson, Arizona
	Robin Clark of the Arizona State Land Department
	Pima County Highway Department

The editorial assistance of Ted Martin, Pima County Sheriff's Department, has been invaluable.