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Lumber Preservation is a technology in Age of Empires IV that can be researched at the Lumber Camp starting in the Castle Age. Once researched, it increases Villagers' gathering rate for Wood by 15%.
Civilization bonuses
- Delhi Sultanate: Technology is free, but takes 5x as long to research (375 seconds instead of 75 seconds).
- French: Economic technologies are 30% cheaper.
- Mongols: improved technology - Villager wood gather rate +20% (cost another 500 stone)