There's a transcription of "Darlin' Corey" in Pete's "How To Play The Five String Banjo". Well, at least it's a transcription of the version he used when he was learning it. It's in a sort of a two-finger style where the melody works its way around a drone set up on the first and fifth strings. (All this from memory as I don't have the book in front of me.) Oh, and it requires tuning your banjo down to an open D (aDF#AD IIRC). Worth the effort, though.