The Ralph Diehl Papers contain business records from his farm as well as records from the various agricultural organizations he was involved with. The collection contains records from Diehl's involvement in the Republican Party, information pertaining to his campaigns, and records from his terms as a state legislator. There are also papers from various other organizations that Diehl was involved in including civic, political, and religious. These records consist of a variety of records particularly correspondence and meeting minutes. They also include information pertaining to the issues Diehl was most concerned with, such as energy and agricultural issues.