- Brad's old Woodward CSSA propeller engine governor on the train layout.
- Large gas turbine jet engine and fuel control history project.
- THE AMERICAN MIXED-FLOW TURBINE WATER WHEEL HISTORY.
- Rest in peace James Leffel.
- American Society of Civil Engineers. Transactions paper No. 1503.
- James Leffel's tombstone showing his patented turbine water wheel.
- James Leffel's tombstone.
- James Leffel's tombstone.
- THE PHOENIX MANUFACTURING COMPANY CATALOGUE.
- History of the E & T Fairbanks Scale Company.
- 5
- 6
- Page 1356. Last page.
- THADDEUS FAIRBANKS (1796-1886 aged 90).
- Page 1355.