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2. Reconnaissance of ground-water resources in the lower Gunnison River Basin, southwestern Colorado
3. Reconnaissance of mine drainage in the coal fields of eastern Pennsylvania
4. Reconnaissance of surficial geology, regolith thickness, and configuration of the bedrock surface in Bear Creek and Union Valleys, near Oak Ridge, Tennessee
5. Reconnaissance of the ground-water, surface water system in the Zekiah Swamp Run Basin, Charles and Prince Georges Counties, Maryland
6. Reconnaissance of the water resources and potential effects of mining of the Joliet-Fromberg coal tract, Carbon County, Montana
7. A reconnaissance of the water resources of the central Guanajibo Valley, Puerto Rico
8. Reconnaissance of the water resources of the Hoh Indian Reservation and the Hoh River basin, Washington
9. A reconnaissance water-quality appraisal of the Fountain Creek alluvial aquifer between Colorado Springs and Pueblo, Colorado, including trace elements and organic constituents
10. The relation of ground-water quality to housing density, Cape Cod, Massachusetts
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