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Geodatabase and Characteristics of Springs Within and Surrounding the Trinity Aquifer Outcrops in Northern Bexar County, Texas, 2010-11

出版	U.S. Department of the Interior, U.S. Geological Survey, 2013
URL	http://books.google.com.hk/books?id=Tj-hAQAACAAJ&hl=&source=gbs_api