TY - GEOGRAPHICAL RESEARCH A1 - QU Xiang-ning, WANG Yi-ming T1 - Investigation on changes of snow cover and climate in Helanshan mountains for the past approximate millennium Y1 - 2006-02-15 00:00:00.0 JF - GEOGRAPHICAL RESEARCH JO - GEOGRAPHICAL RESEARCH SP - 35 EP - 42 VL - 25 IS - 1 UR - {https://www.dlyj.ac.cn/EN/10.11821/yj2006010005} N1 - 10.11821/yj2006010005 ER -