# Approval and Promulgation of State Implementation Plans
> **Rule** · — · Published 1998-05-08 · 63 FR 25415
## Document
- **Document number:** X98-10508
- **Category:** other
- **Federal Register citation:** 63 FR 25415
- **CFR reference:** 40 CFR 52
- **Publication date:** 1998-05-08
- **EPA docket:** FRL 325-6
## Source
- [Federal Register document](https://www.federalregister.gov/documents/1998/05/08/X98-10508/approval-and-promulgation-of-state-implementation-plans)
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