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Wiki information Jaczewski:
Tadeusz Jaczewski was a Polish entomologist who specialised in Hemiptera. Jaczewski studied at the Saint Petersburg State University, then taught at the University of Warsaw. He also worked for the Warsaw Zoological Museum.He published many papers on...
Leonard Jaczewski was a Polish geologist, geographer, engineer and explorer of Siberia. He was one of the pioneers in the study of permafrost.