Secret of the Ages: Unidentified Flying Objects from Inside the Earth
by Brinsley Le Poer Trench
ISBN 13: 9780586043073
Format: Paperback (206 pages) Publisher: HarperCollins Publishers Ltd Published: 08 Jul 1976
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Finding Lost Atlantis Inside The Hollow Earth
by Brinsley Le Poer Trench,Dennis Crenshaw
ISBN 13: 9781892062819
Format: Paperback (200 pages) Publisher: Inner Light - Global Communications Published: 21 Feb 2012