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THE PETRIFIED RIVER Color—Sound U. S. Bureau of Mines 2 8 minutes M. P. O.—Sale Made in cooperation with the Union Carbon and Carbide Cor- poration and produced with the technical assistance of the U.S. Atomic Energy Commission, this film serves to explain the impor- tance of uranium and its use in nuclear fission. First the film explains the geologic theory of the formation of uranium deposits in the beds of prehistoric rivers of the Colorado Plateau. Then it graphically illustrates the prospecting, exploration, mining and milling of uranium ores today. It goes on to introduce us to the modern grinding mills and acid tanks treating tons of rock to recover pounds of precious uranium concentrates. Unusually clear animation demonstrates how uranium's energy will be released and controlled to generate power for great cities in the future. Other sequences show the atomic reactor at Oak Ridge, Tennessee, and the preparation of radioactive isotopes with a dem- onstration of their uses in scientific research, in the fight against disease and in the search of mankind for the secrets of a better life. Better than average photography and production make this film of general interest. It should be noted that geologists and social scientists will find it of particular interest. audience: Junior high; senior high; college; adult ROAD OF IRON Black & White—Sound National Film Board of Canada 42 minutes Rental—Sale Geologists seek iron ore under war pressures, and an iron ore field is opened at Ungava in Northern Quebec. The tremendous problems of transporting the ore, and their solu- tion by modern technology and human perseverance are docu- mented in the National Film Board of Canada production. Planning and financing groups, labor, roads, railroads, towns, power supplies, air fields, dams, machinery and food all play essential parts. The film imparts a great sense of adventure in discovering new sources in the wilderness and in conquering that wilderness in the name of civilization. audience: Junior high; senior high; college; adult 23