More about Don Sheldon from Sheldon Air Service-
Sheldon Review: http://www.sheldonairservice.com/news/don-sheldons-review-today
Glacier Pilot: http://www.sheldonairservice.com/news/don-sheldons-review-today
8 Days to the top: http://www.sheldonairservice.com/news/eight-days-to-the-to
Denali’s Wildlife
Eight Years of Wolf Observation in Denali Park-http://www.sheldonairservice.com/news/eight-years-of-wolf-research-at-mckinley-park