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I would like to thank Bertie Phillips, Susan Crawford, Jeff Farr, and Andrew Potts who assisted me in this study.
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Dorr, D. Division 27 growth and attrition trends. Am J Commun Psychol 5, 491–499 (1977). https://doi.org/10.1007/BF00877951
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DOI: https://doi.org/10.1007/BF00877951