Opus 59, No. 2 before the Coolidges' recording activity abruptly ceased. This one of Opus 18, No. 5, is actually available elsewhere online, from the British Library, but we poor Americans cannot listen to those files, so I'm happy to now be able to provide our chance to hear them:
Beethoven: Quartet No. 5 in A Major, Op. 18, No. 5
The Coolidge Quartet (Kroll-Berezowsky-Moldavan-Gottlieb)
Recorded December 18, 1939
Victor Musical Masterpiece set DM-716, three 78-rpm records
Link (FLAC files, 55.40 MB)
Link (MP3 files, 37.15 MB)
My latest discographic project is an article on the Coolidge Quartet, which was published in the June, 2015, issue of the 78rpm Community's Discographer Magazine. This can be read online here.