Was rushing out the door when I posted that last one (damn the need for employment! I have important games to play!) and a few things occurred to me as soon as my computer shut down.

Regarding the number of resources visible, there are three possible contributing factors as far as I can tell. (1) Time - resources appear according to a set turn clock (2) Merchants - resources appear as the number of merchants increases (3) Buildings - resources appear as the settlement in that specific provinces builds structures that increase trade. Of all of these, (3) seems the most likely. I did not think of it at the time, because that\'s not how increased trade from Markets and such worked in RTW. However, thinking of the areas where more wine resources appeared, they were all cities. I do remember that two of the new wine resources appeared in a province after I converted a Citadel to a City and began developing it. I did not notice the appearance of resources other than wine, but then again I also never looked for them.

So, here is the theory: City structures that increase trade, ALSO make additional resources visible on the campaign map, within their own province.