Interdisciplinary forms and methods of environmental education in the general education polytechnical schools and the higher educational institutes. 

 - Bulgaria :   United Nations Environment Programme,   1983. 
 - 190 P. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MEDIO AMBIENTE<br/>EDUCACION
<br/><br/><label>Universal Decimal Class. No.: </label>504:37