清代河湟谷地农业灌溉水渠的地理空间分布特征
罗仲朋 刘峰贵 陈琼 周强 沈彦俊
清代河湟谷地农业灌溉水渠的地理空间分布特征
Geographical spatial distribution characteristics of agricultural irrigation canals in Hehuang valley in the Qing dynasty
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