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Recharge studies on the High Plains in northern Lea County, New Mexico
John S. Havens
1966, Water Supply Paper 1819-F
The area described in this report is that part of the southern High Plains principally within northern Lea County, N. Mex. ; it comprises about 1,400,000 acres. Hydrologic boundaries isolate the main aquifer of the area, the Ogallala Formation, from outside sources of natural recharge other than precipitation on the...
Mines and prospects, Idaho Springs district, Clear Creek and Gilpin counties, Colorado -- Descriptions and maps
Robert Hadley Moench, Avery Drake Jr.
1966, Open-File Report 66-87
The Idaho Springs mining district forms an important segment of the Front Range mineral belt, a northeast-trending zone of coextensive intrusive rocks and hydrothermal ore deposits of early Tertiary age. This belt, which is about 50 miles long, extends from the region just west of Boulder southwestward across the Front...