Golden Jubilee
Posts: 5187
Joined: Thu Nov 29, 2012 9:28 pm
Location: Lyman, IA
leaf spring data
http://www.springresearch.org/pdf/volume_25.pdf
I would suggest downloading a copy as I am not sure the link will always be active.
edit: If you replace the volume number in the above link, you can access info back to 1932!