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John Alan Glennon (born September 24, 1970) is an American geographer and explorer. His work has been mapping and describing caves and geysers. ==Discoveries and research== 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「John Alan Glennon」の詳細全文を読む スポンサード リンク
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