From Field and Study
| Autor: | Merriam, C. Hart, Skinner, M. P., Jewett, Stanley G., Willett, G., Miller, Loye, Braly, J. C., Arnold, Leroy W., van Rossem, A. J., Carroll, J. J. |
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| Zdroj: | The Condor, 1930 Nov 01. 32(6), 301-304. |
| Databáze: | JSTOR Journals |
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