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Page 6381, results 159501 - 159525

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Publication Extents

Not all publications have extents, not all extents are completely accurate
Le stereorestituteur Kelsh
H. T. Kelsh
1949, Photogrammetria (6) 123
Le stéréorestituteur Kelsh est un appareil de restitution à double projection basé sur le principe des anaglyphes, comme le Multiplex par exemple, mais il a une plus grande précision que ce dernier, vu que les négatifs sont utilisés directement pour la restitution, sans que l'on soit obligé de les réduire...
Determination of color of turbid waters
W.L. Lamar
1949, Analytical Chemistry (21) 726-727
A convenient procedure for determining the color of turbid waters, using the principle of precipitation of turbidity by the electrolyte calcium chloride, is described. Because the stable turbidity of many surface waters cannot be completely precipitated by conventional centrifuging alone, this procedure presents a means of flocculating the turbidity without...
A definition of depletion of fish stocks
John Van Oosten
1949, Transactions of the American Fisheries Society (76) 283-289
Attention was focused on the need of a common and better understanding of the term depletion as applied to the fisheries in order to eliminate if possible the existing inexactness of thought on the subject. Depletion has been confused at various times with at least ten different ideas associated with...
Structure and senses of fish
Ralph Hile
1949, Marine Fisheries Review (35) 48-53
Also printed as U. S. Fish and Wildlife Service. Fisheries Leaflet 132. 13 pp....
Progress report on the sea lamprey study
John Van Oosten
1949, The Fisherman (17) 6, 9-10
SUMMARY: The Peromyscus leucopus on a 17-acre study area were live-trapped, marked, and released over a seven-day period. On the three following nights intensive snap-trapping was done on the central acre of the study plot. The animals caught by snap traps in...
Age and growth of the lake whitefish, Coregonus clupeaformis (Mitchill), in Lake Erie
John Van Oosten, Ralph Hile
1949, Transactions of the American Fisheries Society (77) 178-249
Although the whitefish has by no means ranked first from the standpoint of production, it has always been an important commercial species in Lake Erie. Trends in the output of whitefish have differed in the United States and Canadian waters of the lake. The 1893–1946 average annual yield of 1,201,000...
Trends in the lake trout fishery of Lake Huron through 1946
Ralph Hile
1949, Transactions of the American Fisheries Society (76) 121-147
The production of lake trout, Cristivomer namaycush (Walbaum), in the United States waters of Lake Huron was highest in the earliest years for which there are statistical records, averaging 2,362,000 pounds in 1879–1894. The general level of yield was much lower but relatively stable in 1895–1939, during which period the...
The present status of the United States commercial fisheries of the Great Lakes
John Van Oosten
1949, Transactions of the North American Wildlife Conference (14) 319-330
This review of the trends in production on the Great Lakes suggests that great biological changes have taken place. The general abundance of the choicer varieties, and of some of the less choice fishes, has been lowered considerably; and the prospects are that this level will fall still farther....