Series 1 covers the personal and some business interests of H.D. Myrick. Included are ledgers, cards, and inventory books that cover almost every aspect of the ranch's operation. Also found in this series are more limited collections of Myrick's interests including his involvement with a number of other organizations: financial records from the Methodist Church of Geraldine, stock and correspondence regarding the Farmers Union Grain Terminal Association, and ledgers from the Equity Cooperative Association. There is little personal correspondence in this collection, but included are letters to and from James C. Zanto, the man Myrick leased his ranch to when he moved to Bozeman. This series is arranged with ranch papers, personal finance, personal correspondence, and genealogy files preceding those dealing with the Farmer's Union Grain Terminal Association and the Equity Cooperative Association.

Series 2 of the Myrick Papers deals exclusively with the Square Butte Elevator Company, a business Myrick founded and served as president until its incorporation into the Cooperative Elevator of Square Butte. Included are ledgers, audit reports, articles of incorporation and other information on the company and its employees. When the Square Butte Elevator Company was absorbed into the Cooperative Elevator of Square Butte, Myrick maintained both stock and interest in the new company so there are some pieces dealing with the new Cooperative. The contents of this series are arranged primarily in chronological order across two boxes to show the progression of the company up until it was absorbed into the Co-op.