Study on the Protection of the Wetland in Nandagang
zhang yi-wen 1; zhang jun-hai 1; gao xin-fa 1; wei fu-li 2 (1.college of resource and environment; hebei normal university; shijiazhuang 050016; 2.hebei university of economics and trade; shijiazhuang 050011; china)
..............page:91-94
Preliminary Study on the Essence of Regional Development
xue dong-qian 1; dong suo-cheng 1; yao shi-mou 2; xu gang 2; (1.beijing institute of geographic sciences and natural resources research; cas; beijing 100101; 2.nangjing institute of geography and limnology; cas; nanjing 210008; china)
..............page:76-80
..............page:81-84,94
..............page:35-38,43