HOST RELATIONS OF PARASITIC COWBIRDS 243 



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1919. Cowbird impositions. Oologist, vol. 36, p. 18. 

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1890. Further notes on the cowbird, with remarks on the nesting of the 

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1930. The bird life of Berks County, Pennsylvania. Reading Public 

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1890. More cowbird eggs. Ornithologist and Oologist, vol. 15, p. 31. 

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1950. Middle Atlantic coast region. Audubon Field Notes, vol. 5, pp. 



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1952. Middle Pacific coast region. Audubon Field Notes, vol. 6, p. 298. 

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1953. Sur Physiologie der angeborenen auslosenden Mechanismen. Be- 



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1947. Unusual behavior of a cowbird and scarlet tanager at a red-eyed 

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1961. [Letter on Wiest's observation.] Butler (Pa.) Eagle, December 11, 

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1889. The Blackburnian warbler at home. Ornithologist and Oologist, 

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1934. A few cowbird notes. Oologist, vol. 51, pp. 107-108. 

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1961. Birds of Tarrant County. Pp. 107. 

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1918. The breeding birds of Bexar County, Texas. Condor, vol. 20, pp. 

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1894. Bird nesting in northwest Canada. Nidiologist, vol. 1, pji. 119-120. 

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1893. A few days among the blue-winged warblers. Ornithologist and 

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1912. Personal observations and notes on breeding, migrant, or visiting 

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1933. Observaciones sobre el parasitismo del Tordo {Molothriis bonariensis) . 

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