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1. Agriculture that fits the environment: a look backward and forward (id:IND20394009)

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2. Geographic information systems for managing resources (id:IND20394141)

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3. Marketing conservation in a changing age (id:IND20394056)

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4. Soil and water conservation : a worldwide goal (id:IND20394134)

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5. The earth needs you--join our team (id:IND20394183)