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I 19. 42/ 4- 4 : 2009- 5207 : Water levels and selected water-quality conditions in the Sparta-Memphis aquifer (Middle Claiborne aquifer) in Arkansas, spring-summer 2007 / by T.P. Schrader ; in cooperation with the Arkansas Natural Resources Commission and the Arkansas Geological Survey.
I 19. 42/ 4- 4 : 2009- 5237 : Hydrology, water quality, and causes of changes to vegetation in the vicinity of the Spring Bluff Nature Preserve, Lake County, Illinois, May 2007-August 2008 / by Robert T. Kay ... [and others] ; prepared in cooperation with the Lake County Forest Preserve District and the Illinois State Geological Survey.