Series 



ECONOMIC CIRCULARS 



EC 1-19. § 



*EC 20. Caviar: what it is and how to prepare 

 it, by Lewis Radcliffe. Rev. Oct. 1925. 8 p., 

 illus. 



EC 21-41. § 



*EC 42. Parasites of fresh-water fishes, com- 

 prising some general considerations, by 

 H. S. Pratt. Rev. Feb. 1929. 10 p.. illus. 



EC 43-47. § 



*EC 48. Canned salmon; pink and chum, with 

 ^ 44 recipies, by Henry O'Milley. Rev. 

 Apr. 1926. 7 p. 



*EC 49. Habits of the mud-puppy Necturus , 



an enemy of food fishes, by A. S. Pearse. 

 May 1921. 8 p., illus. 



"EC 50. Trade in fresh and frozen fishery 



products and related marketing consider- 

 ations in Louisville, Ky, by L. T. Hopkin- 

 son. Aug. 1921. 8 p. 



*EC 51. Sources, preparation, and properties 

 of some algal gelatines, by Irving A. 

 Field. Oct. 1921. 7 p. 



*EC 52. Trade in fresh and frozen fishery 



products and related marketing consid- 

 erations in Pittsburgh, Pa., by L. T. 

 Hopkinson. Sept. 1921. 9 p. 



*EC 53. Brine freezing of fish, by Harden F. 

 Taylor. Nov. 1921. 8 p. 



*EC 54. Trade in fresh and frozen fishery 



products and related marketing consid- 

 erations in Chicago, 111., by L. T. Hop- 

 kinson. Dec. 1921. 21 p. 



*EC 55. Trade in fresh and frozen fishery 



products and related marketing consider- 

 ations in Minneapolis and Saint Paul, 

 Minn., by L. T. Hopkinson. Feb. 1922. 

 21 p. 



*EC 56. Care and feeding of buffalo fish in 



ponds, by H. L. Canfield. Dec. 1922. 3 p. 



*EC 57. Mussel survey of Lake Pepin in 1924, 

 with a discussion of the effects of the 

 system of the alternate closure of sec- 

 tions of the lake to the taking of mussels, 

 by J. B. Southall. Apr. 1925. 3 p. 



*EC 58. Oysters: an important health food, 

 with 98 recipes, by Lewis Radcliffe. 

 July 1925. 15 p. 



*EC 59. Cooperative fish culture, by Glen C. 

 Leach. Mar. 1926. 8 p. 



*EC 60. Diamond-back terrapin culture at 



Beaufort, N. C, by Samuel F. Hildebrand 

 and Charles Hatsel. Oct. 1926. 20 p., illus. 



*EC 61. An investigation of the coastal waters 

 of South Carolina with reference to oyster 

 culture, by P. S. Galtsoff and H. F. Pry- 

 therch. 8 p., illus. 



"•;=EC 62. Containers and packages used in 

 shipping shucked oysters, results of a 

 survey of shipping practices, with recom- 

 mendations for improvements in the 

 methods now used, by Gerald Arthur 

 Fitzgerald. Feb. 1928. 16 p., illus. 



*EC 63. Trade in fresh and frozen package 



fish products, by R. H. Fiedler. May 1928. 

 12 p.. illus. 



*EC 64. Condition of the razor-clam fishery 

 of Washington, by H. C. McMillin. Dec. 

 1928. 7 p.. illus. 



*EC 65. Stocking interior waters of the United 

 States, by E. C. Feamow and M. C. James. 

 Dec. 1928. 16 p., illus. 



*EC 66. Oyster bottoms of North Carolina, 

 by Paul S. Galtsoff and H. R. Seiwell. 

 Dec. 1928. 11 p. 



*EC 67. Results of game-fish plantings by the 

 United States Bureau of Fisheries, by E. 

 C. Fearnow. June 1929. 75 p. 



*EC 68. Goldfish industry, by Thom.is Quast. 

 June 1929. 14 p., illus. 



*EC 69. Salmon - an economical and valuable 

 food, by Ward T. Bower. Dec. 1929. 19 p., 



illus. 



*EC 70. Control of the common oyster drill, 

 by Henry Federighi. Mar. 1930. 7 p., 

 illus. 



*EC 71. Fur-seal industry of Pribilof Islands, 

 Alaska, by Henry O'Malley. May 1930. 

 15 p.. illus. 



*EC 72. The Bureau of Fisheries and its 

 biological station at Beaufort, N. C .. 

 by Samuel F. Hildebrand. July 1930. 14 p., 

 illus. 



*EC 73. A cursory survey of the Blue River 

 system of Nebraska, by H. L. Canfield 

 and A. H. Wiebe. Mar. 1931. 10 p. 



*EC 74. Application of preservatives to fish- 

 ing nets, by W. T. Conn. Apr. 1931. 6 p., 

 illus. 



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