可视化

    清代科尔沁农耕北界的变迁
    乌兰图雅, 张雪芹
    Changes of the Cultivation Norhtern Limit for Horqin Region in the Qing Dynasty
    WULAN Tu-ya, ZHANG Xue-qin
    地理科学 . 2001, (3): 230 -235 .  DOI: 10.13249/j.cnki.sgs.2001.03.230