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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse more than 65,000 articles authored by our scientists over the past 100+ year history of the USGS and refine search by topic, location, year, and advanced search.
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Disease and infection in the Tetraonidae
Disease is one of many factors advanced to explain the fluctuations of grouse populations, but no profound study of natural disease losses in Tetraonidae exists. The literature contains frequent references to THE grouse disease, although many potential pathogens are listed in numerous surveys and limited investigations, and the relevant data indicate that no single etiologic agent is universally r
Authors
C. M. Herman
Dynamic similarity in erosional processes
A study is made of the dynamic similarity conditions obtaining in a variety of erosional processes. The pertinent equations for each type of process are written in dimensionless form; the similarity conditions can then easily be deduced. The processes treated are: raindrop action, slope evolution and river erosion.
Authors
A. E. Scheidegger
Egg-associated transmission of IPN virus of trout
No abstract available.
Authors
K. Wolf, M. C. Quimby, A.D. Bradford
Endothal derivatives as aquatic herbicides in fishery habitats
Abstract has not been submitted
Authors
C.R. Walker
Fish and wildlife aspects of chemical mosquito control
No abstract available.
Authors
P. F. Springer
Food of the bloater, Coregonus hoyi, in Lake Michigan
Stomachs were examined from 1,469 Lake Michigan bloaters, Coregonus [Leucichthys] hoyi, greater than 7 inches long which contained identifiable food. An additional 461 ciscoes less than 7 inches long were incorporated into the study; these latter fish were not positively identified, but most of them undoubtedly were bloaters. The specimens were caught in bottom nets except for 49, all less than 6
Authors
LaRue Wells, Alfred M. Beeton
Formalin in the Hatchery
FORMALIN is used extensively in hatcheries to control external parasites of fish. There are reports that formalin is toxic at some hatcheries, especially when used on rainbow trout (Salmo gairdneri). This is a discussion of the development of the use of formalin to control fish parasite-in the hatchery, its properties, and some experimental work.
Authors
R.R. Rucker, W.G. Taylor, D.P. Toney
Geomagnetic polarity epochs and pleistocene geochronometry
[No abstract available]
Authors
A. Cox, Richard R. Doell, G. B. Dalrymple
Geomagnetic polarity epochs: Sierra Nevada II
Ten new determinations on volcanic extrusions in the Sierra Nevada with potassium-argon ages of 3.1 million years or less indicate that the remanent magnetizations fall into two groups, a normal group in which the remanent magnetization is directed downward and to the north, and a reversed group magnetized up and to the south. Thermomagnetic experiments and mineralogic studies fail to provide an e
Authors
A. Cox, Richard R. Doell, G. Brent Dalrymple
Geothermal brine well: Mile-deep drill hole may tap ore-bearing magmatic water and rocks Undergoing Metamorphism
A deep geothermal well in California has tapped a very saline brine extraordinarily high in heavy metals and other rare elements; copper and silver are precipitated during brine production. Preliminary evidence suggests that the brine may be pure magmatic water and an active ore-forming solution. Metamorphism of relatively young rocks may also be occurring within accessible depths.
Authors
D. E. White, E.T. Anderson, D.K. Grubbs