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Effect of topographical factors on podophyllotoxin content in Sinopodophyllum hexandrum and study on ecological suitability Search of Management System Reform of Key State-Owned Forest Districts in Northeast-Inner Mongolia Improvement of algorithm for TEMCF in evaluation of daily mean temperature in mountainous districts Effect of Ratio Source to Sink on Percentage of Head Milled Rice and Chalky Rice of Combinations of Mid-season Hybrid Rice in the South-East Districts of Sichuan Province under High Temperature and Summer Drought