The 1990 World Book year book the annual supplement to the World Book encyclopedia.

Ижил төстэй зүйлс

• The 1990 World book year book The annual supplement to the world book encyclopedia
  Хэвлэсэн: (1990)
• The 1991 World book year book The annual supplement to the world book encyclopedia
  Хэвлэсэн: (1991)
• The 1989 World book year book The annual supplement to the world book encyclopedia
  Хэвлэсэн: (1989)
• The 2003 World Book Year Book The Annual Supplement to The World Book Encyclopedia, A Review of the events of 2002
  Хэвлэсэн: (2003)
• Science year 1990: The world book annual science supplement A review of Science and Technology During the 1989 School year
  Хэвлэсэн: (1989)