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TITLE: Ecosystem : [videorecording] / Hawkhill Associates, Inc.
PUBLISHED: Madison, WI : Hawkhill Associates, c2005.
DESCRIPTION: 1 videodisc : sd., col. ; 4 3/4 in. + 4 guides (22 cm.).
NOTES: Guides include bibliographical references.
NOTES: a "Ecosystems on earth is a primer on the state of earth’s ecosystems as the 21st century begins. Chemical cycles in the biosphere and Food chains in the biosphere feature effective ways to teach these critical concepts to secondary and college classes" - container.
NOTES: English
SUBJECT: Cycles.
SUBJECT: Chemical processes.
SUBJECT: Biotic communities.
SUBJECT: Food chains (Ecology)
SUBJECT: Biosphere.
ADDED ENTRY: Hawkhill Associates, Inc.

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