1. Chalupníci, sedláci a vynálezci Creator: GUTWIRTH, Václav Format: electronic Type: model:article and TEXT Language: Czech Rights: http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
2. Lidé a hmota Creator: GUTWIRTH, Václav Format: electronic Type: model:article and TEXT Language: Czech Rights: http://creativecommons.org/publicdomain/mark/1.0/ and policy:public