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1925 HEYROVSKÝ Jaroslav (1890–1967), Czech fyzikální chemik, discoverer and founder polarografie, Nobel laureate from year 1959; signature on laboratorním certificate; very good condition U:A3s|
1876 MENDEL Gregor Johann (1822–1884), founder of genetics, stamped release with autograph, documentary stamps issue 1875, print seal augustiniánského monastery St. Thomas in Alt-Brünn (Staré Brno); very good condition, exceedingly interesting, sought also abroad! U:A3s|
1839 PRESL John Svatopluk (1791-1849), one from nejvýznačnějších Czech přírodovědců 19. century, Professor zoologie and mineralogie on/for Karlo-Ferdinandově univerzitě in Prague (UK); autograph on vysokoškolském indexu (certificate); slightly toned, else preserved, interesting U:A3s|