Potential future source for a copy
I've used www.superhappyfun.com in the past to find out-of-print titles but they're apparently now out of business. They refer to a site at http://www.notavailableondvd.com/ but it's not up yet. However, if anyone can come up with a copy, they can. I bought a copy of Robinson Crusoe on Mars from Super happy fun many years ago and it was a very good quality copy. So let's keep our fingers crossed.
This story has had a profound effect on many. Camel devoted an entire album to the story*. I'm certain sooner or later it will be published.
*(http://www.amazon.com/Snow-Goose-Camel/dp/B00005V1B2/ref=sr_1_2?ie=UTF8&s=music&qid=1244956970&sr=8-2)