Commentary

Donaldson S. W. : Practice of radiology in the United States; facts and figures. Am. J. Roentgenol. 66: 929 (1951).

Spacing Charles K. DeAmicis Egilda Cowing Russell F. : Radiation-exposure survey of X-ray and isotope personnel. Nucleonics 5: 63–66 (December 1949).

Isenburger Herbert R. : Personal communication.

Soet John C. : Radiation protection from the industrial hygiene standpoint. Indust. Med. Surg. 20: 227–233 (1951).

Parker H. M. : Health-physics, instrumentation, and radiation protection. In Advances in biological and medical physics, edited by Lawrence John H. Hamilton Joseph G . New York, Academic Press, Inc., 1948, vol. I, pp. 223–285.

Williams Charles R. : Radiation hazards in industry. J. Indust. Hyg. & Toxicol. 30: 294–299 (1948).

Evans Robley D. : Protection of radium dial workers and radiologists from injury by radium. J. Indust. Hyg. & Toxicol. 25: 253–269 (1943).

Taft R. H. : Radium lost and found. Charleston, S. C., John J.'Furlong and Son, Inc., 1938.

Evans R. P. : Physical, biological, administrative problems associated with the transportation of radioactive substances. Preliminary report No. 11. Nuclear Science Series No. 205. Washington, D. C., National Research Council, 1950.

(JO)-Beck Clifford K Menius Arthur C. Webb George N. Walter Arthur W. Leonard P. B. Stinson E. H. Paulson J. D. : Program administration and installation design of the nuclear reactor project at North Carolina State College. Publication No. ORO-33. Oak Ridge, Tenn., U. S. Atomic Energy Commission, July 5, 1950.