http://fyi.uwex.edu/agrability/files/2010/02/adaptivecontrols.pdf
http://www.agrabilityinga.com/handcontrol.html
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http://www.agrability.org/Documents/plowshares/ps02.pdf
http://nasdonline.org/document/242/d000043/safety-tips-for-farming-with-paraplegia.html
http://www.agrabilityinga.com/handcontrol.html
You may have to click up to get to the start of this document...
http://www.agrability.org/Documents/plowshares/ps02.pdf
http://nasdonline.org/document/242/d000043/safety-tips-for-farming-with-paraplegia.html