Ovenden, A. E. Costs and earnings investigations of primary fishing enterprises : a study of concepts and definitions / by A. E. Ovenden - Rome : Food and Agriculture Organization of the United Nations, c1961 - ix, 62 p. ; 23 cm. - FAO fisheries study ; no. 10 . ISBN: USD 0.75 (pbk.) Subjects--Topical Terms: Fisheries--Economic aspects Dewey Class. No.: 338.37