CCH Vitallaw's TAX TREATIES, in print at KF6306.US4 is a looseleaf service providing CCH's detailed Topical Index, Case Table, and Finding Lists of Rulings and of Senate Executive Documents. Each binder is organized by country, and tabbed for quick access.
See, also, Vitallaw’s U.S. Tax Treaties Reporter, Tax Treaties Topical Index, and Tax Treaties Report Letters.
Matthew Bender publishes Rhoades and Langer, U.S. International Taxation and Tax Treaties, located at KF6306.R48, also available online through Lexis.