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William Threlfall collection
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Collected reprints, volume I

Collected reprints, volume I

Collected reprints, volume II

Collected reprints, volume II

Studies on the helminth parasites of herring gulls (Larus argentatus Pontopp....

Studies on the helminth parasites of herring gulls (Larus argentatus Pontopp.) on the Newborough Warren Nature Reserve, Anglesey

William Threlfall collection

William Threlfall collection