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An ancient man-made near ground surface rock cavern group was found in Longyou County, Zhejiang Province. The 24 large caverns were excavated 2000 years ago.
浙江省西部龙游县的龙游大型古地下洞室群由24个洞室组成，该洞室群开挖于2000年前。
The 5th Unit, Regional Survey Team, Bureau of Geology and Mineral Resources of Zhejiang Province. Instruction of geologic map (Longyou County breadth), 1995.
龙游县幅。浙江省地质矿产厅区调大队五分队。地质图说明书，1995。
Tang Kaiyuan Twenty-two years (734 years), Longyou earthquake, as the county records were destroyed, the county government moved to South Qin'an significantly pro-chuan.
唐开元二十二年（734年），陇右大地震，成纪县被毁，县治南移至秦安显亲川。
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