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 "London, Kentucky micropolitan area"): Before 2013, the area was officially known as the Corbin-London, KY Combined Statistical Area, and consisted of the Corbin Micropolitan Statistical Area and the London Micropolitan Statistical Area.
Relevant evidence: No