re: Article on wood shrinkage and effect on furniture

George, I think that one difference between air and kiln dried is that heating locks the lignin which is what makes it more dimensionally stable.  Lignin is what gives wood its strength and stiffness.   The extra stiffness means that it is more difficult for the cells to expand so there is not as much room to absorb as much moisture from the air.  Chemical changes in the lignin and cellulose during kiln drying also reduces their ability to absorb moisture or at least slows it down, making the MC of KD wood more stable through wide RH swings.  ...Or something like that.  It has been more than 40 years since I took the wood technology class in college. 

Another good resource is the Woodweb Shrinkage calculator.   If you search for EMC calculator, you will find several websites that you may find useful.

The Wood-Database website George cited above also has a basic explanation of MC and shrinkage concepts for anyone who does not want to wander off into the weeds.