# Approval and Promulgation of Implementation Plans
> **Rule** · — · Published 2004-01-28 · 69 FR 4059
## Document
- **Document number:** 04-55501
- **Category:** other
- **Federal Register citation:** 69 FR 4059
- **CFR reference:** 40 CFR 52
- **Publication date:** 2004-01-28
## Source
- [Federal Register document](https://www.federalregister.gov/documents/2004/01/28/04-55501/approval-and-promulgation-of-implementation-plans)
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