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Magnitude and frequency of floods in the United States, part 3–A. Ohio River Basin except Cumberland and Tennessee River Basins
Paul R. Speer, Charles R. Gamble
1965, Water Supply Paper 1675
This report presents a means of determining the probable magnitude and frequency of floods of any recurrence interval from 1.1 to 50 years at most points on streams in the Ohio River basin except Cumberland and Tennessee River basins.Curves are defined that show the relation between the drainage area and...
A field method for the determination of silver in soils and rocks
H. M. Nakagawa, H. W. Lakin
1965, Open-File Report 65-182
A rapid, sensitive, and specific field method useful in geochemical exploration has been developed for the determination of silver in geologic materials. In this method the sample is digested with nitric acid and the silver is extracted with triisooctyl thiophosphate (TOTP) in benzene and stripped from the organic phase with...
Veins in the northern part of the Boulder batholith, Montana
D. M. Pinckney
1965, Open-File Report 65-123
About 20 miles north of Butte and extending nearly to Helena, is an area of 350 square miles containing hundreds of veins and altered zones. The bedrock of the area is 1) late Cretaceous volcanic rocks, forerunners of the Boulder batholith, 2) the Boulder batholith of late Cretaceous to early...