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20th-century American male writers
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1951 births
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American non-fiction environmental writers
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20th-century American male journalists
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21st-century American male journalists
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Journalists from the San Francisco Bay Area
American environmental journalists

David Helvarg: page information

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CreatedJun 19, 2026, 6:04 PM

UpdatedJun 19, 2026, 6:04 PM