Challenge to Science: The UFO Enigma by Jacques & Janine Vallee. Henry Regnery & Co, 1966. First Edition.

The original 1966 Henry Regnery hardcover edition of this classic of UFOlogy that turned the field on its head, and established the author as the most respected scientific investigator in the field. Includes Foreword by J. Allen Hynek.

Hard to find -- a must-own for students of UFOlogy or unexplained phenomena!

Format: 6.25 x 9.5" hc w dj, 268pp, appendixes, bibliography, index.