docs: def __rm_duplicate_citation_2(self, key):
          """
          Remove exact duplicate entries for abstract or citation fields. Check all publication entries.
          :return:
          """
          citations = []
          # Before writing, remove any duplicate "Full_Citations" that are found
          for idx, pub in enumerate(self.noaa_data_sorted["Publication"]):
              try:
                  citations.append(pub[key])
              except KeyError:
                  # Key was not found. Enter a blank entry in citations list
                  citations.append("")
  
          # Create a backwards dictionary, that lists which indexes are duplicates
          d = defaultdict(list)
          for i, item in enumerate(citations):
              d[item].append(i)
          d = {k: v for k, v in d.items() if len(v) > 1}
          # Duplicates indexes are listed like so:
          # {"full citation info here": [0, 2, 5]}
  
          # Loop over duplicate indexes
          for citation, idxs in d.items():
              # do not process any duplicate entries that were initially blanks.
              if citation:
                  # Loop for [1:], since we want to keep the first citation and remove the rest.
                  for idx in idxs[1:]:
                      # Set citation to blank
                      self.noaa_data_sorted["Publication"][idx][key] = ""