What type of noun appears in all capital letters this sentence Pennsylvania Kentucky and west Virginia mine more coal than any other states?

The noun that appears in all capital letters in the sentence is STATES.

Here's why:

* Proper Nouns: Proper nouns are names of specific people, places, or things. They are always capitalized.

* "States" refers to the specific states of Pennsylvania, Kentucky, and West Virginia, making it a proper noun.

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