APA
Chafin, United States Geological Survey, .Effects of land use on water quality of the fountain creek alluvial aquifer, east-central Colorado. : .
Chicago
Chafin, United States Geological Survey, .Effects of land use on water quality of the fountain creek alluvial aquifer, east-central Colorado. : .
Harvard
Chafin, United States Geological Survey, .Effects of land use on water quality of the fountain creek alluvial aquifer, east-central Colorado. : .
MLA
Chafin, United States Geological Survey, .: . .