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| Background | 1 |
| Conservation (Environment) | 1 |
| Environment | 1 |
| Environmental Education | 1 |
| History | 1 |
| Legislation | 1 |
| Natural Resources | 1 |
| Philosophy | 1 |
| Political Influences | 1 |
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| Smithsonian | 1 |
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| Gilbert, Bil | 1 |
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| Creative Works | 1 |
| Guides - Classroom - Learner | 1 |
| Historical Materials | 1 |
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Gilbert, Bil – Smithsonian, 1990
Presents a historical perspective of the environmental movement in the United States, beginning with Earth Day, 1970. Profiles "environmentalists" and describes environmental activities, achievements with environmental reform, turning points, and proenvironmental legislation from 1970-90. (MCO)
Descriptors: Background, Conservation (Environment), Environment, Environmental Education
