erc: who: United States. General Accounting Office. what: Tax Deductions: Further Estimates of Taxpayers Who May Have Overpaid Federal Taxes by Not Itemizing when: 20020329 where: https://digital.library.unt.edu/ark:/67531/metadc294391/ erc-support: who: University of North Texas Libraries what: Permanent: Stable Content: when: 20081203 where: https://digital.library.unt.edu/ark:/67531/