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  1. Bell 222 crash in Iowa (N30SV) | PlaneCrashMap.com

  2. Sioux Valley helicopter crash 20 years later: Memory lives on

  3. Accident Bell 222SP N30SV, Thursday 20 August 1998

  4. South Dakota remembers 1998 Sioux Valley helicopter crash

  5. Bell 222/230 - Wikipedia

  6. Investigators Find Crack In Rotor Pin Of Doomed Sioux Valley

  7. Hospital says rotor blade caused Sioux Valley helicopter crash

  8. List of Bell 222 helicopters in USA - Helis.com

  9. Bell 222 & Bell 525 - airvectors.net

  10. Memoriam – alecbuck.com