Tax Analysts - Lexis: WWPROC file (1950-current) - more than 150 tax treaties as amended by protocols, exchanges of notes, etc. (treaties in file and current form)..
Tax Analysts - Lexis: WWCASE; cases from over 50 countries interpreting treaty cases
Tax Analysts - Lexis: TAWTT (1828-current) - worldwide tax treaties and U.S. legislative histories; many English translations.
Tax Analysts - Lexis: WWFRCE (1910-current) - treaties that are currently in force organized by country and subject matter (i..e. coffee, sugar, etc).