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The United States. Some persons loving birds. People who think of the birds. Audubon's future generation.
made from kept from got from came from
20-30 years ago 50 years ago recently 30 years ago
study to study studied studying
dating dated date to date
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were, has gone over was, has gone out was, has gone away were, is going down
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who; about which; around one; some an animal; for
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found discovered invented found out
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