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Needs and specifications for an information resource for the release of organisms into the environment (IRRO) : proceedings of a UNEP/MSDN workshop held in Vienna, Austria, and Rockville, MD, USA, 11-15 March 1991 / editors, B.E. Kirsop and M.I. Krichevsky ; participating-supporting organisations, United Nations Environment Programme (UNEP) [and others].