Governor. Correspondence (1906–1938) regarding the Oklahoma Constitutional Convention of 1906, the condition and governance of the state after World War I, and the Okmulgee County (Oklahoma) trial incident; publications (1906–1925), including Referendum News and the Oklahoma Odd Fellow, published by the International Order of Odd Fellows, of which Robertson was a member; newspaper clippings (1914–1938) regarding Robertson; scrapbooks and notebooks (circa 1938) regarding Robertson’s career and influence in politics; speeches (n.d.) by Robertson regarding his positions on prohibition, the eighteenth amendment to the federal constitution, the Oklahoma Department of Pardon and Parole, and his inauguration; along with condolence cards (1938) received by Robertson’s widow and family upon his death. The collection also includes gubernatorial Special Order No. 11 (1922) regarding the membership of Oklahoma National Guard officers in the Ku Klux Klan.