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48 CHALLENGE SERIES ores on the Colorado Plateau, and explains USAEC activities at Grand Junction, Colorado. THE PETRIFIED RIVER (1956). 28 minutes, color. Produced by the Union Carbide Corporation and the U. S. Bureau of Mines under the technical direction of USAEC. For sale by MPO Distribution, at $135.00 per print, including shipping case. This nontechnical film for all audience levels describes how uranium was deposited during prehistoric, geologic ages; prospecting on the Colorado Plateau; mining and milling of uranium ores; and the use of the atom's energy for power and to produce radioisotopes for medical diagnosis and therapy, agriculture, industry and research. THE PORTSMOUTH STORY (1957). 23 minutes, black and white. Produced for USAEC's Oak Ridge Operations, and for sale by, Lookout Mountain Laboratory, USAF, at $44.00 per print, in- cluding shipping case. This semitechnical film, for intermediate through college-level audi- ences, describes the construction of the USAEC gaseous diffusion uranium processing plant at Portsmouth, Ohio. PRODUCTION OF URANIUM FEED MATERIALS (1959). 28 minutes, color. Produced by USAEC Oak Ridge Operations. For sale by Capital Film Laboratories, at $87.31 per print, including shipping case. This is a semitechnical film, for the high-school- and college-level au- diences, describing the step-by-step processing of uranium ore concen- trates to metal reduction and fabrication, in the USAEC feed materials plants at Fernald, Ohio, and Weldon Spring, Missouri. THE SEARCH—URANIUM PROSPECTING AND MINING (1955). 23 minutes, black and white. Produced by Columbia Broadcasting System-Television and the Colorado Mining Association. For sale by McGraw-Hill Book Co., at $145.00 per print, including shipping case. NOT cleared for television. This is a nontechnical film, for intermediate through college-level audiences, telling the story of the exploration, prospecting, and min- ing of uranium ores on the Colorado Plateau. CHALLENGE Series. 29 minutes each, black and white. This series of films, each of which is described below, provides an in-depth description of basic research in the nuclear sciences at the USAEC Argonne National Laboratory. The films visit var- ious facilities in presenting explanations, demonstrations, and