Encyclopaedia of environment,pollution,planning and conservation, Vol.4

Eitemau Tebyg

• Encyclopaedia of environment,pollution, planning and conservation,Vol.5
  gan: Trivedi P R
  Cyhoeddwyd: (1998)
• Encyclopaedia of environment,pollution,planning and conservation,Vol.1
  gan: Trivedi P R
  Cyhoeddwyd: (1998)
• Encyclopaedia of environment,pollution ,planning and conservation ,Vol.6
  gan: Trivedi P R
  Cyhoeddwyd: (1998)
• Encyclopaedia of environment, pollution,planning and conservation,Vol.3 natural resources conservation
  gan: P R Trivedi
  Cyhoeddwyd: (1998)
• Encyclopaedia of Environment, pollution ,Planning and Conservation Vol. 4
  gan: Trivedi, P R
  Cyhoeddwyd: (2000)