The choice of using phonetic spellings for the lyrics means that the lyrics are heavy in the use of words like "dese", "dose", "Heab'n", etc. However, given the original publication being in the 1920's, and the author's comments in the introduction, it is apparent that the spellings are not the result of gross cultural insensitivity.
The respect for, and love of this fine music comes through in the author's comments. And the transcriptions retain the strong harmonic features that are often "arranged out" of collections of aural traditional music.
It is a fine collection, and an absolute steal at the price.