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- Leffingwell, Deborah Leffingwell, OT3386.
- Leffingwell, George L. Leffingwell, US11399.
- Leffingwell, Joseph H. Leffingwell, US11401.
- Leffingwell, Lyman Leffingwell, US10780spouse1.
- Leffingwell, Thomas Leffingwell, OT3384.
