Encyclopaedia of ecology, environment and pollution: vol.vi-science, technology and environment /

Eitemau Tebyg

• Encyclopaedia of ecology, environment and pollution: vol-x the water (prevention and control of pollution) act, 1974 /
  Cyhoeddwyd: (1998)
• Encyclopaedia of ecology, environment and pollution: vol-ix the wildlife alongwith the wildlife (protection)act, 1972 /
  Cyhoeddwyd: (1998)
• Encyclopaedia of ecology, environment and pollution: vol-xiii insurance and the Public Liability Insurance Act, 1991 /
  Cyhoeddwyd: (1998)
• Encyclopaedia of ecology, environment and pollution: vol-xi the air (prevention and control of pollution) act, 1981 rules 1982 notifications /
  Cyhoeddwyd: (1998)
• Encyclopaedia of world environment: 5vols. /
  Cyhoeddwyd: (1999)