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GEOLOGY OF THE COAMO AREA, PUERTO RICO, AND ITS RELATION TO THE VOLCANIC ARC-TRENCH ASSOCIATION; PROFESSIONAL PAPER 636 by Glover, Lynn, III: Soft cover (1971) | Robert Gavora, Fine & Rare Books, ABAA
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File:1950 Census Enumeration District Maps - Puerto Rico (PR) - Ciales Municipality - Ciales Municipality - ED 14-1-26 - NARA - 75639699.jpg - Wikimedia Commons
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