MLA (8th Edition)
Approximate Location of the 10,000-Milligram-Per-Liter Dissolved-Solids Boundary In the Silurian and Devonian Carbonate-Rock Aquifer, Southwestern and Northern Indiana. U.S. Department of the Interior, U.S. Geological Survey, 1994.
APA (7th Edition)
Approximate location of the 10,000-milligram-per-liter dissolved-solids boundary in the Silurian and Devonian carbonate-rock aquifer, southwestern and northern Indiana. (1994). U.S. Department of the Interior, U.S. Geological Survey.