The Postnatal Development, by Donald F. Hoffmeister and Henry W. Setzer  35118
  [Full title: The Postnatal Development of Two Broods of Great Horned Owls]
  [Full author: Donald F. Hoffmeister and Henry W. Setzer]
  [Subtitle: Bubo virginianus]
  [Link: http://www.gutenberg.org/3/5/1/1/35118 ]
  [Files: 35118.txt; 35118-8.txt; 35118-h.htm]

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Many thanks

Janet