UPDATE: After some relatively quick searching, I discovered this image is available via National Geographic’s Stock Imagery. Below is an example of the original image.
The photograph was taken in Horse Canyon in Utah. The photographer was W. Robert Moore. The picture ID is #614798.
To find the photo, go to the NationalGeographicStock.com website and then enter the id of 614798 in the “quick explore” box.
(10/10/2012)
I bought a book from the 1960s full of photographs from America’s National Parks, called “America’s Wonderlands The National Parks National Geographic“. As you can see in the link, I paid a whole $1.60 for it. On Page 222-223 I found this photograph of two jeeps wandering through Canyonlands National Park. It’s too bad the photograph is slightly split by the binding.