Ultrarunning History
143: Grand Canyon Rim-to-Rim History – Part 12: More for 1971-1989
During the 1970s and 1980s the Grand Canyon felt growing pains from thousands of hikers going down and thousands of planes and helicopters going up.
During the 1970s and 1980s the Grand Canyon felt growing pains from thousands of hikers going down and thousands of planes and helicopters going up.