China Historical GIS: https://sites.fas.harvard.edu/~chgis/data/chgis/v6/ 

Caloric Suitability Index: https://ozak.github.io/Caloric-Suitability-Index/  

China Econ Lab: https://chinaeconlab.org/ 

QuantEcon: https://quantecon.org/

Causal Inference: The Mixtape

R as GIS for  Economists

Text Mining with R (A Chinese version)

《中国历史地图集》（The Historical Atlas of China  by Tan Qixiang）