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Barton Marine 2019 728x90

The map of Secchi depth data shows that sailors are taking part in the study all around the world

© Secchi Disk Study
The map of Secchi depth data shows that sailors are taking part in the study all around the world photo copyright Secchi Disk Study taken at
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Exposure MarineGJW Direct 2024 DinghySelden 2020 - FOOTER