Take a photo of a barcode or cover
A bit rambling, but fascinating. Was particularly struck by the author's resourcefulness. What, your boat is irretrievably stuck on the rocks in a narrow canyon? Just wade downstream until you come to a couple of trees, and make a new boat! The Death Valley trip - the reason I read this - is harrowing. Imagine being so thirsty that you can't even swallow food. Hope our experience is less hazardous...