(electronic code of federal regs for the internal revenue code) (California code) (summary of some local rules) (well known tax blog) (responses to frivolous tax defier arguments),,id=110353,00.html (can get you a lot of info, but without cites, on substantive and procedural tax) galore)  (easy to access code, but can be one to two years out of date so be careful) (more responses to frivolous tax legal arguments)  (treaties)

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