# 21-Inch Hypersonic Tunnel at Plum Brook Station at Lewis Research Center
> **NASA OIG audit** · 1997-01-14
## Report
- **Type:** audit
- **Date:** 1997-01-14
- **Modified:** 2024-11-22
## Summary

January 14, 1997

## Source
- [NASA OIG report page](https://oig.nasa.gov/office-of-inspector-general-oig/ig-97-013/)
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