Just to muddy the water a little more, I have a paperback edition of a work entitled Houdini's Spirit World Dunninger's Psychic Revelations. It is 202 pages and has a 16 page signature od B&W photos tipped in.
It is published byTower Publications Inc., 185 Madison Ave, New York, New York. The copyright citation is "Copyright 1925, Liberty Weekly, Inc. Copyright renewed 1963, Liberty Library Corp, Copyright 1968, Liberty Library Corp." I assume that this last reference is for the book at hand.
From a quick browse, it appears to have been a collation of articles written by Dunninger and Houdini for Hugo Gernsback's Science and Invention Magazine.
Could this be the same book?