Lehfeldt, Robert Alfred

1868 – 1927

• A text-book of physical chemistry
• A text-book of physics
• Electro-chemistry
• Gold, prices, and the Witwatersrand
• Restoration of the world's currencies
• Text-book of physics
• Descriptive economics
• Money
• Money
• Restoration of the world's currencies
• Restoration of the world's currencies. --
• The national resources of South Africa