The Subspecies of the Mountain Chickadee, by Joseph Grinnell             33531
  [Subtitle: Vol. 17, No. 17, pp. 505-515]
  [Link: http://www.gutenberg.org/3/3/5/3/33531 ]
  [Files: 33531.txt; 33531-8.txt; 33531-h.htm]

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Many thanks

Janet