@Article{essd-13-5071-2021,
AUTHOR = {Xue, Q. and Jin, X. and Cheng, Y. and Yang, X. and Zhou, Y.},
TITLE = {The dataset of walled cities and urban extent in late imperial China in the
15th--19th centuries},
JOURNAL = {Earth System Science Data},
VOLUME = {13},
YEAR = {2021},
NUMBER = {11},
PAGES = {5071--5085},
URL = {https://essd.copernicus.org/articles/13/5071/2021/},
DOI = {10.5194/essd-13-5071-2021}
}