It's published by Peer International, who still control copyright on all the Jimmie Rodgers songs. Publication date was 1967 and I doubt it is still available except maybe as a used book. A friend who had a duplicate gave me his extra copy in 1970 or 1971. I've never owned or even seen the "Memorial Collection Vol 2," though it's advertised in Vol 1 and the ad includes the contents list for it.

Evidently publishing rights to the Rodgers library have been farmed out by Peer to Hal Leonard Music (www.halleonard.com is their website). Leonard offers a couple of Rodgers songbooks but their web catalog doesn't give a full list of titles in either volume. Looks like between them they'd still fall about 20 songs short of including the full Rodgers song catalog.

See also here:
http://www.abebooks.com/servlet/SearchResults?an=jimmie+rodgers&bsi=30&sortby=2&x=0&y=0&prevpage=1

The first 2 items on this page at abebooks (as of today, 10/02/08) are for a 1940s song folio which explicitly does include "Treasure" and for the "Memorial Collection Vol 1," both on the pricey side ($35 each), from a couple of different booksellers. If you do a search on abebooks for "Jimmie Rodgers" as author, you'll find a number of 1940s folios from Peer. These, I believe, all feature both piano arrangements and guitar chords. (I have a copy of the 1943 "Jimmie Rodgers Album of Songs," which I bought new in the middle 1960s, and this is its nature.) None of the listings give full titles for the 1940s collections; "Treasure," e.g., isn't in the 1943 "JR Album" that I have but is likely to be in one of the others. Over the years Peer packaged the 100+ songs in the JR library into various combinations.

Hope this is some help!