1. 1
   An illustrated key to the British freshwater ciliated protozoa commonly found in activated sludge

   by Curds, Colin Robert
   Published 1969

   London, H.M.S.O., 1969.

   iv, 90 p. illus. 21 cm.

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2. 2
   An illustrated key to the British freshwater ciliated protozoa commonly found in activated sludge

   by Curds, Colin Robert
   Published 1969

   London, H.M.S.O., 1969.

   1 online resource (iv, 90 pages) illustrations.

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   Center for Research Libraries
   

   Online Resource

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3. 3
   Studies on the ecology of ciliated protozoa in activated sludge and their role in the process of sewage purification

   by Curds, Colin Robert
   Published 1963

   University of London, England : 1963.

   1 microfilm reel ; 35mm.

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