Evidence Behind Close Encounters, Project Blue Book, and the Search for Answers
"Copyright 1972, 1975, 2023 by the Estate of J. Allen Hynek."
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15 released booksCollector's Library of the Unknown is a 15-book series with 15 released primary works first released in 1882 with contributions by Ignatius L. Donnelly, Frederick Bligh Bond, and Upton Sinclair.
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