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Research Cave : ウィキペディア英語版 | Research Cave
Research Cave is a Native American archeological site near Portland, Missouri.〔 Locally known as "Arnold-Research Cave" or "Saltpetre Cave", the cave is located in an outcrop of sandstone approximately north of Portland.〔Shippee, J.M. "The Archaeology of Arnold-Research Cave Callaway County, Missouri". ''Missouri Archaeologist'' 28 (1966).〕 it was occupied intermittently for over 8,000 years. It has been recommended for de-designation as a National Historic Landmark due to looting.〔 ==References==
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「Research Cave」の詳細全文を読む
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