So, let's say, take a province like Dacia or Armenia. No resources (except for Dacia's grain, which can be useful), and you can't really make it a commercial province, can't you? Very little bonuses that would stack up a commercial profit, land-locked and further on with details. How do you make an agricultural profile of a certain province that will fully give you some decent regional income and make for a good bread basket as well? What about the other way around? Does a commercial or an industrial specialization work better (of course, considering the resources given as well) ?