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|a Sistema de Bibliotecas de la Universidad de Costa Rica
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| 100 |
1 |
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|a Mayr, Ernst
|d 1904-2005
|e Autor/a
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| 245 |
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|a Speciation in Birds :
|b progress report on the years 1938-1950 /
|c Ernst Mayr.
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| 260 |
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|a Uppsala, Stockholm :
|b Almqvist & Wiksells Boktryckeri AB,
|c 1951.
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| 300 |
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|a páginas 91-131.
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| 500 |
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|a Separata de: Proceedings of the Xth International Ornithological Congress, 1950
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| 916 |
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|a Centro Catalográfico
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| 949 |
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|a -KAF
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