February 21, 2024 Castille, E.L., M.A. Janssen, and C.T. Solomon (2023) Polycentric governance systems’ perceived impact on learning in north-central US lake and watershed organizations. Regional Environmental Change 23: 109. Home » Castille, E.L., M.A. Janssen, and C.T. Solomon (2023) Polycentric governance systems’ perceived impact on learning in north-central US lake and watershed organizations. Regional Environmental Change 23: 109.