Statistical yearbook, 1976 ; Annuaire statistique, 1976 ; Anuario estadístico,1976.
Statistical yearbook, 1976 ; Annuaire statistique, 1976 ; Anuario estadístico,1976.
- Paris : UNESCO, 1977.
- 1074 p.
9230015431
OC 31 (100)=20 =40=60 "1976" STA
9230015431
OC 31 (100)=20 =40=60 "1976" STA