Encyclopaedia of world environment,Vol.1 ecology

Eitemau Tebyg

• Encyclopaedia of world environment,Vol.2 environment
  gan: P R Trivedi
  Cyhoeddwyd: (1999)
• Encyclopaedia of world environment,Vol.4 pollution
  gan: P R Trivedi
  Cyhoeddwyd: (1999)
• Encyclopaedia of world environment,Vol.3 wildlife
  gan: P R Trivedi
  Cyhoeddwyd: (1999)
• Encyclopaedia of environment,pollution,planning and conservation,Vol.1
  gan: Trivedi P R
  Cyhoeddwyd: (1998)
• Encyclopaedia of environment,pollution, planning and conservation,Vol.5
  gan: Trivedi P R
  Cyhoeddwyd: (1998)