Well, here is a link to Smithsonian Folkways, but I don't think they're going to have what you're looking for. They have a lot of good stuff, and you can get CD or cassette copies of anything that was ever in the Folkways catalogue. The fact that Elektra was involved puts a different spin on it. for some reason, Elektra has been stingy in releasing folk reissues. It's a shame, since they had so much.
I few years back, I picked up a nifty 1984 Elektra/Asylum cassette collection called Bleecker and MacDougal, the Folk Scene of the 1960's. It has all sorts of wonderful stuff I haven't seen anywhere else - Fred Neil, Oscar Brand, Erik Darling, Judy Henske, Eric Weissberg, and lots more. Knowing the quality of pre-recorded cassettes, I doubt that this collection will last me very long. I wish it were available on CD, and that Elektra would reissue recordings by these artists.
-Joe offer-