| Title: | Nitrate concentrations, 1936-99, and pesticide concentrations, 1990-99, in the unconfined aquifer in the San Luis Valley, Colorado |
| Author: | Stogner, Robert W. |
| Author: | Geological Survey (U.S.) |
| Author: | National Water-Quality Assessment Program (U.S.) |
| Note: | U.S. Dept. of the Interior, U.S. Geological Survey ;, 2001 |
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| Link: | page images at HathiTrust |
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| Subject: | Colorado |
| Subject: | Groundwater -- Pollution |
| Subject: | Groundwater -- Pollution -- Colorado |
| Subject: | Groundwater -- Pollution -- San Luis Valley (Colo. and N.M.) |
| Subject: | Nitrates -- Environmental aspects |
| Subject: | Nitrates -- Environmental aspects -- Colorado |
| Subject: | Nitrates -- Environmental aspects -- San Luis Valley (Colo. and N.M.) |
| Subject: | Pesticides -- Environmental aspects |
| Subject: | Pesticides -- Environmental aspects -- Colorado |
| Subject: | Pesticides -- Environmental aspects -- San Luis Valley (Colo. and N.M.) |
| Subject: | United States -- San Luis Valley |
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