docs: def get_archive(self, archive_name):
          '''
          Get a data archive given an archive name
  
          Returns
          -------
          archive_specification : dict
              archive_name: name of the archive to be retrieved
              authority: name of the archive's authority
              archive_path: service path of archive
          '''
  
          try:
              spec = self._get_archive_spec(archive_name)
              return spec
  
          except KeyError:
              raise KeyError('Archive "{}" not found'.format(archive_name))