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Harvester Pro

Allows harvesting of strategic and luxury resources!
Also allows for clearing of Floodplains and Reefs with the Engineering Technology

No longer do you have to intentionally delay your tech development to make sure you don't get your district blocked.
This also opens up interesting decisions about short term harvest gains!
Harvesting is unlocked with each respective improvement technology for the resource.

Yields (final yields are based on multipliers depending on how far into the game you are) :