1. 1
   The comparative population ecology of mallard and tufted duck

   by Hill, David A.
   Published 1982

   England : University of Oxford, 1982.

   5 microfiches.

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2. 2
   A comparative ecological study of methods for the control of sheep ticks (Ixodes ricinus L.)

   by Steele, Gordon M.
   Published 1984

   England : University of Oxford, 1984.

   3 microfiches.

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