@data{10.12072/casnw.040.2018.db,
title = {1:700000 land cover data set of Ningxia Hui Autonomous Region in 1990},
author = {YanChangzhen and XieJiali},
url = {http://www.ncdc.ac.cn/portal/metadata/823682f8-9477-4b0a-85d8-45f5e5571ecb},
cstr = {11738.11.ncdc.nieer.2020.1434},
doi = {10.12072/casnw.040.2018.db},
journal = {National Cryosphere Desert Data Center},
publisher = {National Cryosphere Desert Data Center(www.ncdc.ac.cn)}
}