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- 1983
- Nature, Animals & Parks
- 1982
- Nature, Animals & Parks
- 1982
- Public-Policy Reform
- 1981
- Public-Policy Reform
- 1981
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- 1980
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- 1980
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- 1980
- Public-Policy Reform
- 1980
- Public-Policy Reform
- 1980
- Public-Policy Reform
- 1980
- Nature, Animals & Parks
- 1980
- Nature, Animals & Parks
- 1978
- Nature, Animals & Parks
- 1978
- Nature, Animals & Parks
- 1978
- Public-Policy Reform
- 1978
- Public-Policy Reform
- 1978
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- 1977
- Public-Policy Reform
- 1977
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- 1976
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- 1976
- Nature, Animals & Parks
- 1974
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- 1973
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- 1972
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- 1972
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- 1972
- Nature, Animals & Parks
- 1971
- Nature, Animals & Parks
- 1970
- Nature, Animals & Parks
- 1970
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- 1970
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- 1969
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- 1969
- Nature, Animals & Parks
- 1968
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- 1967
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- 1966
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- 1965
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- 1964
- Public-Policy Reform
- 1964
- Public-Policy Reform