Riyandi, M.; Harahap, M. Y. The Legal Force of Riau Governor’s Decree No. Kpts.482.A/XI/1987 on State Land Possession Under Government Regulation No. 20 of 2021: A Study of Decision No. 55/Pdt.G/2023/PN Rhl. J Legal, Brief, Legal Brief 2026, 15, 392-402.