Versions of "No More Auction Block" under its 2-3 titles (first in print was "Many Thousands Gone") and references to sites (Allen, esp. where the music was first displayed) are given in thread 38161: No More

More than one tune variant has been used. Just checked the one in "Songs of Zion" (compiled by Cleveland and Nix) and it is not the tune used in "Blowing in the Wind."