osobnosti 22 science 14 mathematics 8 research 8 chemistry 7 geologické poměry 7 inventions 7 more ... astronomy 6 geology 6 discoveries 6 astronomové 5 dějiny astronomie 5 geological conditions 5 history 5 matematici 5 scientific institutions 5 astronomers 4 physics 4 mineral deposits 4 enterpreneurs 4 history of science 3 geological research 3 geologický výzkum 3 geomorfologické útvary 3 geomorphology 3 geomorphological features 3 historical geology 3 historical geology 3 history of astronomy 3 hydrology 3 less ...