regulations_get_cfr_section

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Read the codified text at a CFR location via eCFR — current or as of a past date. Answers "what does 40 CFR 50.1 say today?" and "...as of 2019-01-01?". Three locations: title + part + section for one section; title + part alone for the whole part (large parts can be very long, and their appendices are named rather than inlined; prefer a specific section when you know it); title + appendix for one appendix, passing the identifier exactly as regulations_browse_cfr emits it. eCFR retains historical versions back to roughly 2017; a date before coverage is rejected with guidance. Current single-section reads are served from a synced local mirror when available; the source is reported.