Pulmonary deposition of uranium oxides: Leach, L. J., Maynard, E. A., Hodge, H. C., Scott, J. K., Yuile, C. L., Sylvester, G.E. & Wilson, H. B. (1970). A five-year inhalation study with natural uranium dioxide (UO2) dust-I. Retention and biologic effect in the monkey, dog and rat. Hlth Phys. 18, 599 Leach L. J., Yuile, C. L., Hodge, H. C., Sylvester, G. E. & Wilson, H. B. (1973). A five-year inhalation study with natural uranium dioxide (UO2) dust—II. Postexposure retention and biologic effects in the monkey, dog and rat. Hlth Phys. 25, 239