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European sources of scientific and technical information /
Published 1981“…London: Longman Group,…”
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Keesing's contemporary archives : weekly record of important world events with index continually kept up-to-date
Published 1931“…London : Longman Group,…”
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Tropical Agriculture : A geographical introduction and appraisal /
Published 1974“…London : Longman Group Limited…”
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