World problems in the classroom.
- Paris : Unesco, 1981.
- 61 p. ; 27 cm.
- Educational studies and documents, 41. .
300 300
92-3-101817-5
United Nations -- Study and teaching.
341.107 / U3w
300 300
92-3-101817-5
United Nations -- Study and teaching.
341.107 / U3w