In addition, there are no restrictions on cross-majors.
The reference books of advanced mathematics are: Advanced Mathematics, the sixth edition (Volume I and Volume II) compiled by the Department of Mathematics of Tongji University, and Higher Education Press.
Other reference books:
Physical geography, Wu Guanghe et al., Higher Education Press, 4th edition, 2008.
Economic Geography, edited by Li Xiaojian, Higher Education Press, first edition in September, 1999.
Regional Analysis and Planning, edited by Cui and Wei Qingquan, Higher Education Press, 1st edition, June 1999.