Water Quality Studies of the Delaware River with Reference to Shad Migration.by M. M. Ellis; B. A. Westfall; D. K. Meyer; W. S. Platner;Effects of Aquatic Weed Infestation on the Fish and Wild Life of the Gulf States.by J. J. Lynch; J. E. King; T. K. Chamberlain; Arthur L. Smith,;Evaluation of Fisheries in Determining Benefits and Losses from Engineering Projects.by Richard A. Kahn; George A. Rounsefell;DDT Investigations by the Fish and Wildlife Service in 1946.by Arnold L. Nelson; Eugene W. Surber;Toxicity of Phenyl-Mercuric Lactate for Fish.by M. M. Ellis