By Cockerill Kristan   Titus Jonathan   in Applied Environmental Education and Communication: an International Journal

ISSN:1533-015X|3|3|163-170

Routledge Ltd‎(2004)‎

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By Titus Jonathan H.   Whitcomb Sean   Pitoniak Hillary J.   in Canadian Journal of Botony

ISSN:1480-3305|85|10|941-948

NRC Research Press‎(2007)‎

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