Tim Jumper' "Banjo Player's Songbook" has a ton of songs, though not all are OT. It's still a great book because Tim's arrangements are so clean. They are a good springboard for making more involved versions of the songs.
I've been going through the Milliner/Koken tune list on slippery hills website since I got back into old time music a year or two ago. After a little more digging, I realized that Koken was Walt! My old banjo mentor. I grew up watching him and Clare (and a number of others) play old fiddle tunes around Steelville, PA and man those guys can play. Walking encyclopedias. There is quite a group of old time musicians in that area of Pennsylvania. I was a punk with a fretless mountain banjo I could barely play but they were always the most humble welcoming folks. I can't read music so the Milliner/Koken book isn't the most useful to me as a player, but it's an amazing resource just as a compilation of old time tunes. Shouldn't be hard to track down Recordings on the list and pick them out by ear, or if you can read, adapt the tunes for the banjo. A good number of them (maybe most of them?) are designed for banjo/string band accompaniment
There was an indie compendium being sold out of McCabe's on the West Coast for a while there. Skeletal tab arrangements of a vast array of oldtime clawhammer tunes rendered in a Round Peak-inspired style that you could rearrange or build on at will. Can't recall the gent's name, and I think he has passed away. It was a fine resource.