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While it is possible to use general legal periodical indexes such as Index to Legal Periodicals or Current Law Index to find tax articles, there are some indexes with a specific tax focus such as the following:
Federal Tax Articles (CCH) [KF 6285 .F43] Available in NYLS Library (no current subscription after Apr. 2012)
Index to Federal Tax Articles (Goldstein) [KF 6271 .G64 ] Available in NYLS Library (no current subscription)
WG&L Tax Journal Digest [KF6271 .J68] Available in NYLS Library