1. Baldwin, A. D., G. W. Barrett, C. E. Barthel Jr., D. T. Fairburn, and R. E. Wilson. 1975. A new direction for the training of graduate students in environmental education. Journal of Environmental Education 6:50–56.
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5. Barrett, G. W. 1985. A problem-solving approach to resource management. BioScience 35:423–427.