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3Published 1986“...National Academy Press,...”
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4Published 1989“...National Academy Press,...”
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8Published 1989“...National Science Foundation,...”
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9Published 1982“...National Science Foundation,...”
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10Published 1989“...National Science Foundation,...”
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11Published 1995“...National Science Foundation,...”
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12Published 1991“...National Research Institute,...”
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16Published 1971“...National Recreation and Park Association,...”
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