In reply to Doug:
I've done some (limited) exploration in the area and climbed a handful of routes here and there in 1999 and again in 2000. I only went twice due to frustration with fickle ice conditions and far too much snow. But at least it's possible to 'commute' out of the area if all else fails - as the upper Ubaye (many short and not-so-short icefalls accessible from the D900), Les Orres (excellent routes when in condition) and the whole Queyras region are all within driving distance. There's even a new guide to the latter:
http://www.approach-outdoor.com/topos-cascade-de-glace/4958-cascades-en-que...
I agree that "Cascades de glace - Champsaur - Valgaudemar - Dévoluy" is probably out of print now as it was always quite a rare book, with very limited distribution even when first published.
http://glace.montagne05.fr/?id_rubrique=9 I have a copy, purchased from the shop in Gap mentioned on the above link. There's a slight chance that they may be able to help and it may be worth giving them a call - Vertige Montagne +33 4 92 51 91 78 (Usual caveats apply so don't assume/ expect any fluency in English.)
I also have a copy of the much older "Cascades de glace du Sud Dauphine" by Didier Leon, which has some (inferior) coverage of the area but that is long out of print. Otherwise, as Doug says, in the absence of a current printed guidebook, then Camp to Camp is your invaluable friend, with plenty of good info/ topos/ maps etc.:
https://www.camptocamp.org/books/150935/fr/cascades-de-glace-champsaur-valg...
Many of the region's icefalls are visible from a road; some are very easily accessible too - eg those at Tourrengs - where we saw lynx prints in the snow as we walked off from the top of La Centrale.
Get in touch if you need any more specific info.
Post edited at 12:29