Oregon Revised Statutes Miscellaneous Matters Related to Government and Public Affairs § 193.080

If an affidavit of publication is made in an action, suit or proceeding pending in a court, it may be filed with the clerk thereof; if not so made, it may be filed with the county clerk of the county where the newspaper is printed. In either case, the original affidavit, or if the same is filed with the clerk, a copy thereof, duly certified, is primary evidence of the facts stated therein.