Lakes: Aging and Pollution
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Copyright
Registered 1Jan71 · MP21651 (Jul-Dec 1971) Copyright holder: Centron Corp., Inc
Complete catalog record
Features underwater photography and other techniques to explain the aging process of lakes. Examines plants, fish and animal life found in lake habitats. Investigates changing water quality and succession of organisms in lakes as they change from youth to middle age to old age and death. Emphasizes man’s impact in speeding the aging process.
Related films
Sources
- 16mm Filmography (legacy record) — title, year, creator, length, catalog record
- U.S. Copyright Office, Catalog of Copyright Entries (renewals, 1970–1978) — copyright
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