The Scarborough book is "On the Trail of Negro Folk-songs" by Dorothy Scarborough (1925, Harvard University Press)(reprinted in 1963 by Folklore Associates, Hatboro, PA). Emily Dorothy Scarborough was born in Texas in 1878. Her father was a district judge and trustee of Baylor University. She got a BA from Baylor in 1896 and MA in 1899. She taught in the public schools for a while and then became an English instructor at Baylor. She got a PhD from Columbia University in 1917 and taught creative writing and English until her death in 1935. She wrote a number of books, probably her most famous (at least to this group) was "A Songcatcher In the Southern Mountains" which was published after her death. her writing style is very chatty, devoting much space to describing the anecdotes relating top how she obtained this and that song including details about the people she got them from.
As for "Most done Lingerin'Here" all the lyrics she had in the book are in the other thread.