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6th International Soil Conservation Conference on Soil Conservation for Survival, 6th - 18th November 1989
International Soil Conservation Conference 6, 1989, Addis Ababā; NairobiMartin Grunder
其他書名
Post-conference tour (16-18 november 1989), Central Ethiopian Rift Valley
出版1989
URLhttp://books.google.com.hk/books?id=N9xeYgEACAAJ&hl=&source=gbs_api