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Schafer, E[dwin] G[eorge] ; P. 1. Effect of crop rotations on succeeding crops. By E. G. Schafer. P. 2. Effect of crop rotations on productivity of the soil. By L[awrence] C[lifford] Wheeting and S[ilvere] C[yril] Vandecaveye
出版1937
URLhttp://books.google.com.hk/books?id=uSEruAAACAAJ&hl=&source=gbs_api