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1Publicado 1988New Delhi, India : UNESCO-UNEP International Environmental Education Programme, 1988.327 p. : ill. ; 25 cm.
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2Publicado 2000New Delhi : Washington, D.C. : Library of Congress Office ; Library of Congress Photoduplication Service, 2000.4 microfiches.
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3Publicado 2000New Delhi : Washington, D.C. : Library of Congress Office ; Library of Congress Photoduplication Service, 2000.7 microfiches.
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4Publicado 2000New Delhi : Washington, D.C. : Library of Congress Office ; Library of Congress Photoduplication Service, 2000.3 microfiches.