The early history of the echo-sounder in marine fisheries
Hodgson, W.C.; Fridriksson, A. (1981). The early history of the echo-sounder in marine fisheries, in: Thomasson, E.M. (Ed.) Study of the sea: The development of marine research under the auspices of the International Council for the Exploration of the Sea. pp. 165-169
In: Thomasson, E.M. (Ed.) (1981). Study of the sea: The development of marine research under the auspices of the International Council for the Exploration of the Sea. Fishing News Books: Surrey. ISBN 0-85238-112-3. 256 pp., more
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