Lukáš Ackerman studying a plutonite rock sample using a pocket magnifier
![Lukáš Ackerman studying a plutonite rock sample using a pocket magnifier Lukáš Ackerman zkoumá lupou vzorek plutonitu](https://webarchiv.lib.cas.cz:443/wayback/20200504151435im_/https://www.gli.cas.cz/en/system/files/users/public/zajic_5/gallery_assist/gallery_1507/prev/f3.jpg)
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Lukáš Ackerman studying a plutonite rock sample using a pocket magnifier
Lukáš Ackerman studying a plutonite rock sample using a pocket magnifier