- GEMS FROM SRI LANKA: RUBIES, SAPPHIRES, PEARLS. MINES AND HISTORY
- AGRICULTURE IN SRI LANKA: LAND USE AND TENURE, HISTORY AND METHODS
- CROPS IN SRI LANKA: RICE, RUBBER, COCONUTS, FRUITS, CINNAMON AND SPICES
- TEA IN SRI LANKA: HISTORY, CULTIVATION, PRODUCTION, BUSINESS AND EXPORTS
