Montana Agricultural Statistics 2021 

https://www.nass.usda.gov/Statistics_by_State/Montana/Publications/Annual_Statistical_Bulletin/index.php

North Dakota custom rates 

https://www.ndsu.edu/agriculture/ag-hub/ag-topics/farm-management/nd-county-rents-prices

https://www.ndsu.edu/agriculture/ag-hub/ag-topics/farm-management/2020-north-dakota-custom-rates