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. 2020 Dec 9;10:21527. doi: 10.1038/s41598-020-78498-6

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

PMC Copyright notice

Overview of sapropel sampling points for a specific lake. All pictures were made in cooperation with geological research company “Geo Consultants, Ltd.” and are the property of RSU Laboratory of Hygiene and Environmental Health, prepared in accordance with the LVS EN 1997–2 AC:2014 L (Eurocode 7 – Geotechnical design – Part 2: Ground investigation and testing).