It depends on the circumstance. If you are looking for one in the Roman Curia, you would have to go by which Congregation (department) he heads and the reason for the contact. If you are looking for one in the United States, you would have to search for him by his Metroplitan See (archdiocese). For example, if you wanted to contact Daniel Cardinal DiNardo, you would have to write to him at his Houston address…
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