Challenge to Science [The UFO Enigma]. by Vallee, Jacques; Vallee, Janine; Hynek, J. Allen (foreword).

Challenge to Science [The UFO Enigma]. Vallee, Jacques; Vallee, Janine; Hynek, J. Allen (foreword).: 2266 London Tandem 1974 Paperback, good condition only, black & white photos centre spread, some foxing, pages browned, edgewear, rubber stamps (including title page). 268 pp. The authors make out a solid case for scientific investigations of worldwide UFO reports. ISBN: 0426130987 $10.00AUD
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