# Approval and Promulgation of Implementation Plans
> **Rule** · — · Published 2001-03-08 · 66 FR 13854
## Document
- **Document number:** 01-55506
- **Category:** other
- **Federal Register citation:** 66 FR 13854
- **CFR reference:** 40 CFR 52
- **Publication date:** 2001-03-08
## Source
- [Federal Register document](https://www.federalregister.gov/documents/2001/03/08/01-55506/approval-and-promulgation-of-implementation-plans)
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