622.92  Newspaper publications — how proved.
  Publications required to be made in a newspaper may be proved by the affidavit of any person having knowledge of the fact, specifying the times when and the paper in which the publication was made, but such affidavit must be made within six months after the last day of publication.
[C51, §2427; R60, §4042; C73, §3697; C97, §4680; C24, 27, 31, 35, 39, §11349; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §622.92]
Proof of publication, 
R.C.P. 1.314