I don't think this is common knoledge (appologies if it is).
Modding trade goods in descr_regions does nothing at all. It DOES NOT add those trade goods to the map.
What adds resources to the game is adding them in the descr_strat. I had thought this was purely cosmetic, but it is what the computer actually goes by when distributing resources to regions. The descr_regions text file is used for hidden resources only, from what i can tell.
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