Example:
- State = 'PA' and Province/Region = 'Appalachian Region' will return only coal samples for the Appalachian Region within the state of Pennsylvania.
- State = 'PA' and Province/Region = 'Appalacian Region' and 'Ash, % dry >= 10' will return the Pennsylvanian Appalachian Region coal samples that have an Ash quantity of 10% or greater.
- The second search criteria will return fewer records than the first.
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