Ian Mercer

1944

• Crystals
• Crystals
• Gemstones (Resources)
• Gemstones and the environment
• Les pierres précieuses
• Oil (Resources Today)
• Oils and the environment
• Volcanoes
• Countryside Council for Wales Accounts 1993-94
• Gemstones
• Gemstones (Resources Today)
• Oil (Resources & the Environment)