Thanks for your question Rebecca
The Department of the Interior's Bureau of Land Management (BLM) has some great resources for those researching land use. They have a large number of their General Land Office records available here Home - BLM GLO Records. For Oregon you can search for patents, surveys, and control document index records.
The BLM also has a map and data page specific for Oregon it can be found here: Maps and Data Oregon/Washington BLM . The General Land Office (GLO) of the Bureau of Land Management is the custodian of several million land records. You may want to start here Reference - BLM GLO Records. The reference site has a history of the management of land records and brief history of public lands in the west.
The National Archives has records of the Bureau of Land Management at a number of facilities across the country. The records are kept in Record Group 49 the Records of the Bureau of Land Management 1685-2006. The National Archives at Seattle holds records from 1851-1978. A brief description can be found at the bottom of the page here https://www.archives.gov/seattle/holdings/rg-001-049.html. Contact information for the National Archives at Seattle can be found on their main page at https://www.archives.gov/seattle/public/.
That's not all that the National Archives has on land records. Grazing permits show up in a few record groups other than Record Group 49. You may want to look over our introduction to land records research at Land Records. Or search the catalog for grazing permits.
Of course you can always send an inquiry to the National Archives and Records Administration at firstname.lastname@example.org and they can help point the way.
Hope this helps and best of luck in your research.
Thank you for the info!
Thank you for your help!