Hi everyone, I'm playng at lowest level (settler) with Pericles. During the Industrial age I discover Steam Power; it reveals Coal. I realise that there is no Coal in my territory or in the near; I'm adopting a very peacemongering strategy, so I don't want to conquer other civs' cities near to Coal. I decide to try the following strategy: I have dozens of techs of advantage with the other AI civs so I search for sufficiently weak AI civs with at least 2 Coal resources on their territories (they are Charlemagne and Zara Yacob, at the same tech level) and I donate them all the technologies they need to "see" and improve Coal. After this, they surely will be friendly and, I think, they will trade the surplus Coal with me; the donated techs are: 1st turn: Paper and Guilds; 2nd turn: Printing Press, Banking and Gunpowder; 3rd turn: Replaceable Parts and Chemistry 4th turn: Steam Power. After 5-6 turns my explorers and my spies allow me to see that all the Charlemagne's and Zara's squares with Coal are improved (mines and roads) and connected with the rest of their Empires, but in the Trade Proposal Screen I can't see Coal in the Resources list, neither with Zara nor with Charlemagne, and I don't know why. Could anybody helps?