1. The river-originated 51Cr has been used to investigate the Columbia River plume in 1965 by Osterberg, C., Cutshall, N., and Cronin, J. (in preparation).
2. Miyake, Y., Saruhashi, K., and Katsuragi, Y., Papers Meteorol. Geophys., Tokyo, 11, 188 (1960).
3. Miyake, Y., Saruhashi, K., Katsuragi, Y., and Kanazawa, T., Papers Meteorol. Geophys., Tokyo, 12, 85 (1961).
4. Wilson, R. H., Evaluation of Radiological Conditions in the Vicinity of Hanford for 1962 (Hanford Laboratories, AEC Res. and Dev. Rep. HI-76526, 1963).
5. Miyake, Y., Tsubota, H., Radioisotopes in Hydrology, 425 (Intern. Atomic Energy Agency, Vienna, 1963).