共 50 条
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- [7] FISH FINDING WITH SONAR .4. CONDITIONS ON FISHING GROUNDS [J]. WORLD FISHING, 1970, 19 (02): : 24 - &
- [9] FISH FINDING WITH SONAR .6. REVERBERATION - SURFACE, WAVE, WRECK AND TEMPERATURE ECHOES [J]. WORLD FISHING, 1970, 19 (05): : 30 - &