2024 16 USC 460cccc – John Wesley Powell National Conservation Area

2023 16 USC 460cccc – John Wesley Powell National Conservation Area

2022 16 USC 460cccc – John Wesley Powell National Conservation Area

2021 16 USC 460cccc – John Wesley Powell National Conservation Area

2020 16 USC 460cccc – John Wesley Powell National Conservation Area

2018 16 USC 460cccc – Ste. Genevieve National Historical Park