"Income tax Law and legislation." . . "Excess profits tax United States." . . "Income tax Law and legislation United States." . . . . . "Federal tax guide"@en . "Federal tax guide" . . . . . . . . . . . . . . . . . . . "CCH federal tax guide"@en . . . "Commerce Clearing House." . . "Taxation Law and legislation United States." . . "Excess profits tax." . . "United States." . . . . "Taxation Law and legislation." . .