- WOODWARD GOVERNORS AT WORK.
- A 1945 Woodward Governor Company History Book.
- A Woodward 75 year anniversary book(1870-1945).
- Brad's Sundstrand hydraulic transmission APU governor manufactured by Woodward.
- A Rockford machine shop manufacturing history project.
- The Rockford Tool Company.
- A Rockford machine shop manufacturing history project.
- A Rockford machine shop manufacturing history project.
- A Rockford machine shop manufacturing history project.
- Made In Rockford.
- Made In Rockford.
- INGERSOLL MILLING MACHINE COMPANY.
- A Rockford machine shop manufacturing history project.
- INGERSOLL MILLING MACHINE COMPANY.
- THE BARBER-COLMAN COMPANY HISTORY.