Question: The London, Kentucky micropolitan area is made up of how many counties, in the Eastern Kentucky Coalfield, the part of the Central Appalachian bituminous coalfield, including all or parts of 30 Kentucky counties?
Sentence (from "Eastern Kentucky Coalfield"): The Eastern Kentucky Coalfield is part of the Central Appalachian bituminous coalfield, including all or parts of 30 Kentucky counties and adjoining areas in Ohio, West Virginia, Virginia and Tennessee.
Relevant evidence: Yes