Jan Krejčí
Jan Krejčí (28 February 1825 – 1 August 1887) was a Czech geologist, educator, journalist and politician. He wrote the first Czech textbook of geology in 1860, whose revised edition was released again in 1877 under the title ''Geologie čili nauka o tvarech zemských se zvláštním ohledem na krajiny Československé''.
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