Hugard, Jean & Frederick Braue: The Invisible Pass ©1946 Jean Hugard & Fred Braue Publishers, NY & CA Hardcover, no dj, 29 pages

Image courtesy eBay seller SorcererGuy

Comments: Photographs by Raymond Allen; Illustrated by Donna Allen.

Contents (courtesy Denis Behr's Conjuring Archive):

5 Introduction (Paul Rosini)
7 Foreword
11 The Invisible Pass
25 Resume
27 Summary