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]

Referred to in §622.52