Nathan R. Ottosen

title	media type	ISBN-13 (ISBN-10)	year of publication
INTO THE DEPTHS a Grand Canyon Hike	Paperback	978-1-320-11518-6 (1-320-11518-7)	2012
INTO THE DEPTHS a Grand Canyon Hike	Hardcover	978-1-320-11519-3 (1-320-11519-5)	2012