- Preferred Citation:
- "Portal of the Horseshoe Tunnel 1", Hal Riegger Papers, 1981-1986, Digital Initiatives, University of Idaho Library
- Reference Link:
- In Copyright – Educational Use Permitted. Digital reproduction rights assigned to University of Idaho Library by source. For more information, please contact University of Idaho Library Special Collections and Archives Department at email@example.com.
- Standardized Rights: