Assessing the quality and accuracy of the quotation I leave to others, to insufficient my guitar skills. But as Alfred Music seems to own the rights to the printing rights, I think that the songs are recorded at least no worse than one that knows of several other works.
As Led Zeppeling fan I also have the "Little Black Book" (only chords listed) and since the listing of the songs is in here but significantly better. The 8 songs are listed both in notes and in Tabs.
I particularly like that with "Bron-Yr-Aur" one of my favorite acoustic songs - Stairway to Heaven you will find elsewhere more often - is included, although this is not as well known. With "Babe I'm Gonna Leave You" is also another beautiful, not so well-known acoustic song represented.
