This image is a derivative work of the following images: File:Unbalanced_Flexbone_Formation.PNG licensed with Cc-by-sa-3.0-migrated, GFDL 2006-11-24T19:37:06Z...
DescriptionUnbalanced Flexbone Formation.PNG Unbalanced flexbone formation in American football Date 24 November 2006 Source Own work Author User:Surachit...
