Echo sounding and sonar for fishing.

Eitemau Tebyg

• Echo integrator absolute constants put into real numbers /
  gan: Ford, J. S.
  Cyhoeddwyd: (1974)
• Shipboard fish scouting and electronavigational equipment /
  gan: Averkiev, V. P. (Vladimir Pavlovich)
  Cyhoeddwyd: (1985)
• Echo sounding at sea : (British practice) /
  gan: Galway, Henry, Sir, 1859-1949
  Cyhoeddwyd: (1951)
• Acoustic echo-sounding measurements of temperature and wind fluctuations /
  gan: Wescott, J. W.
  Cyhoeddwyd: (1970)
• Field guide to the fish of Puget Sound and the Northwest coast /
  gan: Somerton, David
  Cyhoeddwyd: (1976)