[Changes in the planting structure in Guanzhong following the drought of 1928-30].
Zheng
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D000383:Agriculture / Q000191:economics / Q000193:education / Q000266:history; D002681:China / Q000208:ethnology; D018556:Crops, Agricultural / Q000191:economics / Q000266:history; D003466:Cultural Characteristics; D004467:Economics / Q000266:history; D019649:Food Industry / Q000191:economics / Q000193:education / Q000266:history; D003368:Gossypium; D006076:Government / Q000266:history; D049673:History, 20th Century; D009892:Opium / Q000191:economics / Q000266:history; D011640:Public Policy; D012423:Rural Health / Q000266:history; D012424:Rural Population / Q000266:history; D012923:Social Class; D012959:Socioeconomic Factors; D013783:Textile Industry / Q000191:economics / Q000193:education / Q000266:history; D014908:Triticum / Q000191:economics / Q000266:history
D009892:Opium