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43. 2 Type: model:periodicalitem and TEXT Language: English Rights: http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
44. 2 Type: model:periodicalitem and TEXT Language: English Rights: http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
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49. 20 let Amatérské jeskyně / Creator: Přibyl, Jan Type: studie Subject: speleologie, jeskyně, Československo 1969-1989, and vědy o neživé přírodě, přírodní prostředí, astronomie Language: Czech Rights: unknown
50. 200 let pomocných věd historických na filozofické fakultě Univerzity Karlovy v Praze Type: text and sborníky Subject: Historická věda. Pomocné vědy historické. Archivnictví Language: Czech Rights: unknown