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Page 6323, results 158051 - 158075

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Publication Extents

Not all publications have extents, not all extents are completely accurate
Population ecology of the mallard: I. A review of previous studies and the distribution and migration from breeding areas
David R. Anderson, Charles J. Henny
1972, Resource Publication 105
This report, the first of a series of reports on a comprehensive analysis of population data on the? millIard at? the continental level, provides background information including a review of the history of waterfowl management and a resume of previous studies of the mallard. The breeding range of the mallard...
Limnological studies of Big Bear Lake, California
Elmer G. Pearson, George A. Irwin
1972, Open-File Report 72-295
Big Bear Lake exhibited seasonal changes in physical, chemical, and biological variables from June 1968 to June 1969.Dissolved-oxygen concentrations were depressed during the summer resulting in anaerobic conditions near the bottom of the lake. Water temperature decreased with depth in spring and summer, although classical thermal stratification was not observed....
Some effects of a heated pipeline on ground-water flow in Alaska
Charles E. Sloan, John D. Bredehoeft
1972, Open-File Report 72-349
The thaw bulb produced by a heated pipeline buried in a stream channel may intercept water confined in shallow unfrozen zones beneath a seasonally frozen layer. Resulting movement of ground water through the thaw bulb might produce quick conditions in the pipeline foundation materials. A digital model showed that such...
Interim results of geological investigations in the vicinity of the Ergani-Maden massive copper deposits near Maden, Elazig, Turkey
A.E. Weisseborn, Omer Oner, Metin Sengun
1972, Open-File Report 72-446
As a result of geologic studies and geochemical reconnaissance by Griffitts, Albers, and brier in 1969 in the Ergani-Maden district of eastern Turkey, seven areas were recommended for more detailed investigation. Two of these, here termed Areas 1 and 2, were mapped geologically and sampled geochemically in June and July...