Abstract
The essential features of a levelling device can easily be attached to a sampling quadrat frame to make a dual purpose instrument.
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References
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Mettam, C. A combined quadrat-level for rocky shore surveys. Hydrobiologia 99, 155–156 (1983). https://doi.org/10.1007/BF00015043
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DOI: https://doi.org/10.1007/BF00015043