By Geoff Norcross
http://stream.publicbroadcasting.net/production/mp3/knau/local-knau-623307.mp3
Flagstaff, AZ – In their new book, Grand Obsession: Harvey Butchart and the Exploration of Grand Canyon, co-authors Tom Myers and Elias Butler talk about Butchart's motivation for exploring more of Grand Canyon on foot than anyone else.