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Seeded Area of Crops by County in 1990
Seeded Area of Crops by County in 1998
Yields of Crops by County in 1999
Seeded Areas of Crops by County in 1999
Seeded Area of Crops by County in 1995
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Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences
Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences