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Suitable period and change of tourism climate in Ningxia in the past 39 years

GUAN Jing-de, WANG Yong-qing, SUN Yin-chuan, WANG Su-yan
Arid Land Geography . 2020, (2): 339 -348 .  DOI: 10.12118/j.issn.1000-6060.2020.02.07