Proceedings, review papers and contributions= Actes, rapports de synthése et communications.
Proceedings, review papers and contributions= Actes, rapports de synthése et communications.
- Paris : UNESCO, 1969.
- 430 p.; 30 cm. il., map.
DO 551.46: 639.2 =20 =40 PRO.
DO 551.46: 639.2 =20 =40 PRO.