The Rational Exploitation of the Sea Fisheries with Particular Reference to the Fish Stock of the North Sea.by G. P. Baerends; Jan Hahn; Howard A. Schuck;Possibilities for Oyster Culture in Puerto Rico and the Virgin Islands.by Walter A. Chipman; Paul E. Thompson;Biological Investigations of the Fishery Resources of Trinity River, California.by James W. Moffett; Stanford H. Smith;The 1950 Opening of the Bonnet Carre Spillway: Its Effect on Oysters.by Philip A. Butler; James B. Engle