TY - BOOK AU - Szafer,Władysław AU - Michajłow,Włozimierz TI - Protection of man's natural environment: a collective work initiated and planned by Władysław Szafer, AV - QH75 .S95 PY - 1973/// CY - Warszawa PB - PWN-Polish Scientific Publishers N1 - At head of title: Polish Academy of Sciences. Committee on the Protection of Nature and Natural Resources. Nature Protection Research Centre ER -