Dan Yao, Yun Han. Border Study Tour Resource Mapping and Characteristic Route Design in Heilongjiang: A Practical System of Border Study Tours for Prosperous, Stable and Secure Borderlands. erstp [Internet]. 2026 Jun. 30 [cited 2026 Jul. 15];2(3):34-7. Available from: http://ojs.iajournals.cn/index.php/erstp/article/view/391