陕北长城沿线地区土地退化态势分析
刘彦随,Jay Gao
Trend Analysis of Land Degradation in the Zone along the Great Wall in Northern Shaanxi
LIU Yansui, Jay Gao
地理学报 . 2002, (4): 443 -450 .  DOI: 10.11821/xb200204009