Bibliography and Citations

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Bull E.L.  1987.  Capture techniques for owls. RM-142.  
Bull E.L.  1989.  Great gray owl: Strix nebulosa.  
Bull E.L.  1983.  Longevity of snags and their use by woodpeckers. RM-99.  
Bull E.L.  1989.  Pileated woodpecker: Dryocopus pileatus.  
Bull E.L.  1980.  Resource partitioning among woodpeckers in northeastern Oregon.  :109pp.