This article or image contains material based on a work of a National Park Service employee, created during the course of the person's official duties. As a work of the U.S. federal government, such work is in the public domain. See the NPS website (http://www.nps.gov/) and NPS copyright policy (http://www.nps.gov/disclaimer.htm) for more information.

w:Grand Canyon rescue helicopter circa 1978.

source [1]

This image or media file contains material based on a work of a National Park Service employee, created as part of that person's official duties. As a work of the U.S. federal government, such work is in the public domain in the United States. See the NPS website and NPS copyright policy for more information.