New UNESCO source book for geography teaching / 
Edited by Norman J. Graves. 
 - Paris :  UNESCO;  Longman Group Limited,  1982. 
 - xxii, 394 p. ;  il. 
<br/><br/><label>ISBN: </label>9231019341 (UNESCO cased) 0582361214 (Longman cased) 0582361222 ( Longman papers) 923101935X 
<br/><br/><label>No. de Clasificación Universal Decimal: </label>91 (07) =20 "1982" NEW.