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41. Land use and land cover

Louisiana Geological Survey. Louisiana Geological Survey,.

42. Mississippian aquifer of Iowa

Horick, Paul J. Iowa Geological Survey,.

43. Modified geologic map of Nevada : map 5-1, water for Nevada--mineral projections /

Archbold, N. L. (Norbert L.), 1930- compiler, cartographer. Nevada Bureau of Mines and Geology, University of Nevada,.

44. Nihon suiri chishitsu zu Hydrogeological map of Japan /

Murashita, Toshio. Chishitsu Chōsajo].

45. Nitrate in ground water using a model to simulate the probability of nitrate contamination of shallow ground water in the conterminous United States /

Hitt, Kerie J. U.S. Dept. of the Interior, U.S. Geological Survey,.

46. Potential risk to ground water

Louisiana Geological Survey. Louisiana Geological Survey,.

47. Potentiometric surface of the upper Floridan Aquifer in Florida, May 2000

Marella, Richard L. Florida Geological Survey,.

48. Reconnaissance of ground-water resources of northeastern Valley County, Montana

Geological Survey (U.S.). U.S. Geological Survey :.

49. Water-level surface in the Chicot equivalent aquifer system in southeastern Louisiana, 2009

Tomaszewski, Dan J. U.S. Geological Survey ;.

50. Zhongguo di xia shui you fa wei hai tu

Zhongguo di tu chu ban she,.