Concentration, the master key to psychical development
By: by W.J. Colville.
Contributors: Harry Houdini Collection (Library of Congress)
Publisher: Thomas G. Newman
Place of publication: San Francisco, Cal
Language: eng
Number of pages: 24
Subjects: Parapsychology.
Other titles: Our occult forces
Notes: Cover title.

Publisher's advertisements: p. 23-24.

LC copy has inscription: Martha B. Moody. Bookseller's label: Fred M. DeWitt, Oakland, Cal.

With: Colville, W.J.  A catechism of spiritual philosophy ... Chicago, Ill. : Progressive Thinker Publishing House, c1912.  Bound together subsequent to publication.