New book of knowledge V.20: W.X.Y.Z

Antzeko izenburuak

• New book of knowledge, Vol.20: W.X; Y.Z
  Argitaratua: (1976)
• World book encyclopedia W.X.Y.Z Vol.21
  nork: Nault, William H and et al. Ed
  Argitaratua: (1995)
• The Macmillan family Encyclopedia V20 W-X-Y-Z
  Argitaratua: (1980)
• New Book Of Knowledge
  Argitaratua: (1972)
• New Book Of Knowledge
  Argitaratua: (1972)