UNESCO's programm e for arid lands.
UNESCO's programm e for arid lands.
- 2a ed.
- Paris : UNESCO, 1961.
- 32 p.; 27 cm. map., retrs.
- UNESCO information manuals; 3 .
341.16: 002 (252) (100)=20 1961PRO No.3.
341.16: 002 (252) (100)=20 1961PRO No.3.