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Publication Extents

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The Foraminiferal Genus Orbitolina in North America
Raymond Charles Douglass
1960, Professional Paper 333
The foraminiferal genus Orbitolina has been useful as an index fossil in the Cretaceous rocks of the circumglobal equatorial belt for nearly a century. In Europe and the Near and Middle East enough work has been done on the species to allow their use for approximate correlations within the Cretaceous...
Flow resistance in sinuous or irregular channels
Luna Bergere Leopold, Ralph A. Bagnold, M. Gordon Wolman, Lucien M. Brush Jr.
1960, Professional Paper 282-D
The resistance to fully developed turbulent flow at constant depth in an open channel increases as the square of the mean velocity as long as the boundary conditions remain completely unchanged. The presence of the free water surface allows the possibility of departure from the relationship of resistance to the...