https://www.amazon.de/Kosmos-Algenf%C3%BChrer-wichtigsten-S%C3%BC%C3%9Fwasseralgen-Mikroskop-Kosmos-Naturf%C3%BChrer/dp/3440131734/
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https://www.amazon.de/Das-Leben-Wassertropfen-Dieter-Krauter/dp/344012634X
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https://www.amazon.de/gro%C3%9Fe-Kosmos-Buch-Mikroskopie-Bruno-Kremer/dp/3440146758