1. L. Machta, Fallout Program. Quarterly Summary Report, HASL-155 (1965), p. 297.
2. J. Harley, Ibid.,-149 (1964), p. 138.
3. L. Salter, Ibid.,-158, (1965), p. 269.
4. M. Kalkstein, Science,137, 645 (1962).
5. L. Machta, Fallout Program. Quaterly Summary Report, HASL-142 (1964), p. 300.