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Hydrologist Nora Nelson swapping passive charcoal samplers in a test

By Water Resources Mission Area 2020 (approx.)
Hydrologist Nora Nelson swapping passive charcoal samplers in a carbonate spring during a fluorescein dye tracer test
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Hydrologist Nora Nelson swapping passive charcoal samplers in a carbonate spring during a fluorescein dye tracer test Great Basin National Park. Station number 385254114114801 Spring BW2 in the South Fork of Big Wash, Great Basin National Park, NV

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Public Domain.