Environmental conservation education in the school curriculum in East European countries : proceedings and documentation, International Seminar of the East-Europe Committee, IUCN Commission on Education, Kroscienko-Szczawnica, Poland, 22-28 June 1972

Environmental conservation education in the school curriculum in East European countries : proceedings and documentation, International Seminar of the East-Europe Committee, IUCN Commission on Education, Kroscienko-Szczawnica, Poland, 22-28 June 1972

Publication
1973