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Search results for "valley floors"

Viewing 21 - 26 of 26 results by relevance

Surface Coal Mining Effects on Ground Water Recharge  (1990)

Land Use Planning and Oil and Gas Leasing on Onshore Federal Lands  (1989)

Lost Crops of the Incas: Little-Known Plants of the Andes with Promise for Worldwide Cultivation  (1989)

Biographical Memoirs: Volume 51  (1980)