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The status and breeding biology of marsh harrier Circus aeruginosus and Montague's harrier Circus pygargus in Britain since 1900

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1. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.279006

Identifer	oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:279006
Date	January 1990
Creators	Underhill-Day, John Christopher
Publisher	Open University
Source Sets	Ethos UK
Detected Language	English
Type	Electronic Thesis or Dissertation