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1Argitaratua 1979GaiakConference Proceeding Liburua
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2Argitaratua 1995Gaiak “...Endangered species United States....”
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5Argitaratua 1996Gaiak “...Endangered species....”
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6nork Yaffee, Steven LewisGaiak “...Endangered species Government policy United States....”
Argitaratua 1982
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10nork Jakobsson, Kristin M., 1957-Gaiak “...Endangered species Economic aspects....”
Argitaratua 1996
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11nork Noss, Reed F.Gaiak “...United States. Endangered Species Act of 1973....”
Argitaratua 1997
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13Argitaratua 1975Conference Proceeding Liburua
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