703.819 703.820 PROTECTION Protection of mans natural environment. A collective work initiated and planned by Władysław Szafer. Prepared for publication by the Editorial Committee headed by Włodzimierz Michajłow. Transi, from the Polish manuscript by Andrzej Diniejko /i in./ Warszawa 1973 PWN 8° s. 663, tabl. 4, ilustr. Polish Academy of Sciences Committee of the Protection of Nature and Natural Resources Nature Protection Research Centre