1. Hasler, A. D., Underwater Guideposts: Homing of Salmon (University of Wisconsin Press, Madison, Milwaukee and London, 1966).
2. White, H. C., Trans. Amer. Fish. Soc., 360 (1934).
3. White, H. C., Rep. Biol. Board Canada 1933, 41 (1934).
4. Nordeng, H., Nytt. Mag. Zool., 10, 67 (1961).
5. Harden Jones, F. R., Fish Migration (Edward Arnold, London, 1968).