WFF 'N PROOF
Subtitle: the game of modern logic
By: by Layman E. Allen.
Edition: 1972 ed.
Publisher: Autotelic Instructional Materials Publishers
Published: 1972
Place of publication: New Haven, Conn
Language: eng
Number of pages: 168
Subjects: WFF 'N PROOF (Game); Mathematical recreations.
Other titles: WFF and PROOF.
Notes: Includes bibliographical references.