Concise AACR2rule 50C2

50C2.

If different forms appear in the chief sources of information, use (in this order of preference):
  1. the form not linked to other words in the chief source
  2. the predominant form
  3. the brief form
  4. the later or latest from.
6. Government, as used in these rules, means any body (national, federal, regional, or local) that has jurisdiction over a particular area: country, state, province, county, city, municipality, etc.

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