Elliott Carter's String Quartet No. 5.
The Oakland Public Library doesn't have a copy, though they had the first and second quartets.
The San Francisco Public Library supposedly has a copy, but it's not on the shelves and the card catalog does not say it's been checked out.
The Berkeley Public Library doesn't have a copy.
UC Berkeley's Music Library has a copy, but I don't have a library card for the UC system.
I should have gotten a copy via interlibrary loan a couple of weeks ago, but I didn't. If you have a copy, I'd pay for FedEx to get it here by Wednesday, Jan. 9. Email me or post a comment here if you have a copy handy.