research guide Federal Tax research guide Federal Tax research guide to Federal Tax research guide research guide to Federal Tax Duke Law Library – Intro to Tax Research research guide to Federal Tax research guide research guide to Federal Tax research guide research guide Duke University Federal Tax Research Guide Duke Law Library – Intro to Tax Research Federal Tax Duke Law Library – Intro to Tax Research Federal Tax Federal Tax overview of tax authorities Federal Tax Federal Tax research guide to Federal Tax Duke Law Library – Intro to Tax Research research guide to Federal Tax Federal Tax Duke Law Library Guide: Federal Tax