| Formal academic background | | | | |
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| Professional journals and peer-reviewed publications | | | | |
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| Colleagues and co-workers | | | | |
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| Professional development or training | | | | |
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| Traditional knowledge about local environmental resources, handed down through cultural transmission | | | | |
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| An intuitive understanding of natural processes and systems | | | | |
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| Repeated personal observations | | | | |
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| Data from state/federal agencies | | | | |
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| Internet based resources | | | | |
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