Iowa Code § 649.7
In the proof of title to real estate derived from deeds or other conveyances affecting real estate, executed prior to January 1, 1905, where it appears from recitals therein that such deeds or other conveyances have been executed in pursuance to a contract assigned by the original vendee or the vendee's assignee to the grantee in such deeds or other conveyances, the recitals thereof shall be presumptive evidence of the truth of said recitals, and of the fact of said assignment, and that such assignment was made in good faith for a valuable consideration, and no action shall be maintained by such original vendee, assignee, or any person or persons holding by, through, or under such vendee or assignee, against the grantee in said deed or other conveyance, and the grantee's grantees in the record chain of title, and said recitals shall be conclusive evidence of the fact of such assignment and that it was made in good faith and for a valuable consideration.
Iowa Code § 649.7
Referred to in §649.8