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Keyword [natural factors]
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1. Separation Of The Dominant Factors Working On The Regional Ecological Environment Evolvement And Their Intension On The Enviroment
2. Geochemical Study Of Land Suitability Of Liao River Basin
3. Study On The Change Of Ecological Service Value And Its Driving Forces In Tianshui Economic Zone
4. Quantitative Assessment Of The Impacts Of Human Activities And Natural Factors On River Water Quality And Establishment Of Nutrients Criteria In A Waterashed
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