MAKE A MEME View Large Image Secchi disk pattern.svg The pattern conventionally painted on Secchi disks especially those used in lakes Krążek Secchiego służący do pomiaru przezroczystości wody Own 2005-11-01 User Mysid Hydrology Measuring instruments ...
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Keywords: Secchi disk pattern.svg The pattern conventionally painted on Secchi disks especially those used in lakes Krążek Secchiego służący do pomiaru przezroczystości wody Own 2005-11-01 User Mysid Hydrology Measuring instruments Oceanographical instruments
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