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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 5,500 book chapters authored by our scientists over the past 100+ year history of the USGS and refine search by topic, location, year, and advanced search.
Filter Total Items: 6152
Variations in the biological vulnerability of birds to insecticides Variations in the biological vulnerability of birds to insecticides
No abstract available.
Authors
James O. Keith
Surface faulting and related effects Surface faulting and related effects
No abstract available.
Authors
Manuel G. Bonilla
Nickel-cobalt anomalies in laterite at Jabal Jedair Nickel-cobalt anomalies in laterite at Jabal Jedair
No abstract available
Authors
Louis Gonzales
Aquilapollenites (Rouse) Funkhouser — Selected Rocky Mountain taxa and their stratigraphic ranges Aquilapollenites (Rouse) Funkhouser — Selected Rocky Mountain taxa and their stratigraphic ranges
The genus Aquilapollenites and its type species, A. quadrilobus, are redescribed, and the latter is illustrated. This report summarizes our present information on stratigraphic ranges of selected Rocky Mountain species and varieties of Aquilapollenites. Of the 17 taxa included in this report, 10 are previously named species, 4 are new species, and 3 are new varieties. One species is...
Authors
Bernadine D. Tschudy, Estella B. Leopold
Ground water resources of Iowa Ground water resources of Iowa
No abstract available.
Authors
W. L. Steinhilber, P. J. Horick
Surface water resources of Iowa Surface water resources of Iowa
No abstract available
Authors
W. W. Wiitala
Lymphosarcoma of the thymus of salmonids Lymphosarcoma of the thymus of salmonids
No abstract available.
Authors
Roger L. Herman
Survival and development of lake herring (Coregonus artedii) eggs at various incubation temperatures Survival and development of lake herring (Coregonus artedii) eggs at various incubation temperatures
Lake herring eggs stripped and fertilized from a local stock were incubated in a constant-flow incubator at constant temperatures ranging from 0 to 12.1° C. Rate of development, percentage survival, percentage of abnormal and normal hatching, and length of fry at hatching were determined. The average incubation time from fertilization to 50% hatch varied from 37 days at 9.9-10.3° C to...
Authors
Peter J. Colby, L.T. Brooke
Palynology of the Cretaceous-Tertiary boundary in the northern Rocky Mountain and Mississippi Embayment regions Palynology of the Cretaceous-Tertiary boundary in the northern Rocky Mountain and Mississippi Embayment regions
In both the Rocky Mountain and the Mississippi Embayment regions it is often difficult to distinguish Upper Cretaceous from lower Tertiary rocks on the basis of physical characteristics; the transition can be recognized with relative ease, however, on the basis of abrupt qualitative changes in plant microfossils. Many Cretaceous species vanish and new species appear in the Paleocene. In...
Authors
Robert H. Tschudy