1991 The state of the world environment

Ижил төстэй зүйлс

• 1991 Annual report of the Executive Director
  Хэвлэсэн: (1992)
• United nations environment programme Report of the governing council
  Хэвлэсэн: (2003)
• State of the Environment in Asia and the Pacific Synthesis
  Хэвлэсэн: (2006)
• Annual report 1990
  Хэвлэсэн: (1991)
• Geostatistical Methods Recent developments and applications in surface and subsurface hydrology
  Хэвлэсэн: (1992)