I'm assuming you mean the Gershwin, Porter, Rodgers & Arlen.
You absolutely must hear Night in Manhattan, then.
And now it's available along with the Berlin & Youmans Columbia songbooks, a later R&H date, and a few other tidbits on a 2-cd set from Jazz Factory, The Complete Fifties Studio Masters.
The LP of A Night in Manhattan had the contents of the 10-inch version, plus several tracks from the Berlin & Youmans projects, which may have never made it beyond 10". I think this set was the first time all that material was released on CD.
Also on the set is a 1965 date with Joe Bushkin as accompanist, and she still sounded fine.
I also have several discs of airchecks, some with alternate versions of the Night in Manhattan repertoire.