1. Pijete vodu z watercooleru? Creator: Markéta Chlupáčová and František Kožíšek Type: PDF vydavatele and TEXT Language: Czech Rights: http://creativecommons.org/publicdomain/mark/1.0/, policy:public, and cc:by-nc-nd
2. Pitný režim Creator: František Kožíšek Type: PDF vydavatele and TEXT Language: Czech Rights: http://creativecommons.org/publicdomain/mark/1.0/, policy:public, and cc:by-nc-nd
3. Vlastní studna Creator: František Kožíšek Type: PDF vydavatele and TEXT Language: Czech Rights: http://creativecommons.org/publicdomain/mark/1.0/, policy:public, and cc:by-nc-nd