Focus On Erosion
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✎ Suggest a correctionShows Lewis and Clark Caverns in Montana, Crater Lake in southern Oregon, Bussento River in Italy and Grand Canyon in Arizona. Excerpts from Screen News Digests.
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Sources
- A-V Online (National Information Center for Educational Media). CD-ROM database of educational and documentary media, compiled and maintained by the National Information Center for Educational Media (NICEM). — title, year, creator, length, format, sound, description
- 16mm Filmography (legacy record) — catalog record
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