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Turning Points in Time

Soil Conservation Society of America. Meeting

其他書名	Land, People, Water : Proceedings of the 25th Annual Meeting, Soil Conservation Society of America, August 9-12, 1970, York University, Toronto, Ontario
出版	Soil Conservation Society of America, 1970
URL	http://books.google.com.hk/books?id=52NeGQAACAAJ&hl=&source=gbs_api

註釋Contains papers presented at 25th annual meeting of Soil Conservation Society of America held in Toronto, August 9-12, 1970. Topics include: soil and water conservation and management, land resource use, water pollution, human resources, and future challenges for conservationists.