Most but I don't think all of Pierre Henry's Philips albums, plus a bunch of much more recent 
material, has been reissued by Decca France in a 10CD box, "Odyssee." It can be had for about $4 per 
disc from Amazon 3rd-party sellers, particularly ImportCDs. Unfortunately, the booklet is in French 
only, and I couldn't find an English translation to download anywhere online.

There is an interesting article about Henry as "the original sampling artist" here:
http://facsimilemagazine.com/2009/05/
on the right hand side, top of page. There are sound examples from several of the Philips albums.

I wouldn't be surprised if snippets of Henry's early 60's material is embedded in sound effects all 
over TV and movies.

-- Tom Fine