triple frequency echo sounder
By: D.H. Cushing and I.D. Richardson.
Contributors: Richardson, Ian D.
Series: Great Britain. Ministry of Agriculture, Fisheries and Food. Fishery investigations -- ser. 2, v. 20, no. 1.; Fishery investigations -- ser. 2, v. 20, no. 1.
Publisher: H.M.S.O.
Published: 1955
Place of publication: London
Language: eng
Number of pages: 17
Subjects: Echo sounding in fishing.
Notes: Includes bibliography.