Title Work Title No: 15380 Medium: Moving Image Date: 1971 (Release) Original Summary: "Describes the work of a paleontologist, and explains the basic causes of extinction that occurred to most animal species over the period of prehistoric life. Studies those species which still exist today, and analyzes why other species from earlier eras are extinct." - Summary from Worldcat. Countries of Origin: U.S.A. Genres: Educational | Items x3
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