Admissibility of boundary evidence...

"Courts have always been liberal in receiving evidence with regard to boundaries which would not be strictly competent in the establishment of other facts. Old surveys, perambulation of boundaries, even reputation, are constantly received on the question of boundaries of large tracts of land. The declarations of surveyors made at the time of making a survey have been admitted; and, at all events, it seems to be now a recognized rule of the land law of Texas that field-notes of surveyors, especially if deposited in the general land-office, are to be received as evidence on this subject." -Ayers v. Watson, 137 U.S. 584 (1891), 11 S.Ct. 201, 34 L.Ed. 803