1 9 nian zhi qian bi ye lun wen cha zhong
1 9 nian zhi sheng ji nian hui lun wen
1 9 nian zhi liang yue huo dong lun wen
1 9 nian zhong guo dian ci jian ce lun wen ji
1 9 nian zhong guo nong cun jing ji lun wen
1 9 nian zhong guo wai jiao xin li nian lun wen
1 9 nian zhong guo xing shi yu zheng ce lun wen