Got that one too. Blue cover. My other "classical" dials include the Hovhaness (yellow) and the Schoenberg 3rd quartet (green). The Webern and Schoenberg quartet material (and much more) is available in a wonderful 6 disc Rudolf Kolisch box on Music & Arts.
BTW, for the uninitiated, "#5 & 9" are opus numbers, not the quartet numbers.
30+ years ago I discussed reissuing all the Dial classical material with Ross Russell. Wish I could find the correspondence. Gotta be here somewhere.