622.61  Foreign unwritten law.
  The unwritten laws of any other state or government may be proved as facts by parol evidence, or by the books of reports of cases adjudged in their courts.
[C51, §2444; R60, §4064; C73, §3719; C97, §4652; C24, 27, 31, 35, 39, §11314; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §622.61]