# Approval and Promulgation of Implementation Plans
> **Rule** · — · Published 2001-12-27 · 66 FR 66769
## Document
- **Document number:** 01-55534
- **Category:** other
- **Federal Register citation:** 66 FR 66769
- **CFR reference:** 40 CFR 52
- **Publication date:** 2001-12-27
## Source
- [Federal Register document](https://www.federalregister.gov/documents/2001/12/27/01-55534/approval-and-promulgation-of-implementation-plans)
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