52 



REFERENCES: Ahlstrom Cont'd 



HODGSON, W.C. 1950. "Echo Sounding and the Pelagic Fisheries". United King- 

 dom, Min. of Agr, and Fi sher ies , Fishery Inves t i ga t ions Series 2, Vol, 17, 

 no. 4. 25 pp. 



HOLME, N.A. 1949. "A New Bottom-sampler". Jour. Marine Biol. Assoc United 

 Kingdom Vol. 28, no. 2, pp. 323-332. 



ISAACS, JOHN D. , and KIDD, LEWIS W. 1951. "A Mldwater Trawl". University of 

 California, Scripps Institution of Oceanography. SIO Ref. 51-51. 10 pp. 



ISAACS, JOHN D., AHLSTROM, ELBERT H. KIDD, LEWIS W. , and THRAILKILL, JAMES R. 

 1953. "A High-Speed Plankton Sampler". (Manuscr ipt ) . 



JOHNSON, MARTIN W. 1948. "Sound as a Tool In Marine Ecology, from Data on 

 Biological Noises and the Deep Scattering Layer". Sears Found. Jour. Marine 

 Res. Vol. VII. no. 3. pp. 443-458. 



LUCAS, C.E. 1940. "Ecological Investigations with the Continuous Plankton 

 Recorder; the Phytoplankton In the Southern North Sea, 1932-37". Hull Bull. 

 Marine Ecol. Vol. 1, no. 4. pp. 73-170. 



NIELSEN, E. STEEMANN. 1951. "Measurement of the production of Organic Matter 

 In the sea by Means of Carbon-14". Nature. Vol. 167, 28 Apr. 1951. p. 684. 



SPILHAUS, A. P., and MILLER, A.R. 1948. "The Sea Sampler". Sears Found. J. 

 Mar. Res. Vol. VII, no. 3. pp. 370-385. 



SOUND, OSCAR. 1943. "The Fat and Small Herring on the Coast of Norway In 1940 

 - The Modes of Occurrence of the Herring In the Sea as Revealed' by Echo-Sound- 

 Ing", Annales Biologiques . Vol. 1, 1939-41. pp. 60-72. 



TUCKER, G.H. 1951. "Relation of Fishes and Other Organisms to the Scattering 

 of Underwater Sound". Sears Found. Jour. Marine Res. Vol X, no. 2, pp. 215- 

 238. 



WIBORG, KRISTIAN FREDRIK. 1948. "Experiments with the Clarke-Bumpus Plankton 

 Sampler and with a Plankton Pump In the Lofoten Area In Northern Norway". 

 Report on Norwegian Fishery and Marine Invest. Vol. IX, no. 2. 1-32, 1951. 

 "The Whirling Vessel; an Apparatus for the Fractlonlng of Plankton samples". 

 Report on Norwegi an Fishery and Marine Invest. Vol. IX, no. 13. 16 pp. 



WOOD, HENRY, and PARRISH, B.B. 1950. "Echo-Sounding Experiments on Fishing 

 Gear In Action", /. Cons. Int. Explor. Mer. Vol. XVII, no. 1, pp. 25-36. 



