Abstract: Records of the Secretary of the Department of Revenue (1967-1992) and its predecessors: Assessor of Incomes (1920-1934), Office of the Tax Commissioner (1934-1939), and Commissioner of the Department of Taxation (1939-1967). Major topics include the income tax, beverage and cigarette tax, corporate tax, exemptions, property tax relief, local tax assessment, Milwaukee, mining, legislation related to state revenue, simplification of tax procedures, economic development, federal and state cooperation, interstate commerce, marital property tax reform, shared revenue, school aids, sales tax, taxation of railroads, taxation of public utilities, interstate reciprocity, and the lottery credit.