Iowa Code § 558.10: Patents covering land in different counties.

Where the certificate of the secretary of the interior or the patents cover real estate situated in more than one county, the secretary of state shall, upon the application of any railroad company or its grantee, prepare and furnish, to be recorded, a list of all the real estate situated in any one county so granted, patented, or certified; and all such evidences of title shall be entered by the auditor upon the index, transfer, and plat books.