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Number of surveys per 5 year period during the course of FLORIVON project. |
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| Part of: Sparrius LB, van Heeswijk J, Dirkse GM, Verhofstad MJJM (2019) The FLORIVON flora survey in the Netherlands between 1902 and 1950. PhytoKeys 135: 11-20. https://doi.org/10.3897/phytokeys.135.30069 |