SDCL § 31-19-8: Service of summons--Unknown parties--Publication of summons.

The summons under § 31-19-7 may be served as in civil actions unless otherwise provided in this chapter. If there are unknown owners or persons interested in the property to be taken or damaged, or if any of the defendants are not residents of the state, the plaintiff may apply to the court upon affidavit setting forth the nature of the proceeding, and the facts in relation to such unknown persons or nonresident defendants, for an order of publication of such summons, whereupon the court shall grant such order.