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1
The kew record of taxonomic literature : relating to vascular plants 1992 (2) scanned during May-July 1992.
Published 1992“…HMSO ,…”
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2
Research for practical arboriculture : proceedings of a Seminar held at the University of York, 2-4 April, 1990
Published 1991“…HMSO ,…”
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11
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Pesticides 1991 : pesticides approved under the control of pesticides regulations 1986.
Published 1991“…HMSO ,…”
Book