<https://educationforum.ipbhost.com/topic/19-aviation/page/2/#comment-2627>
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"SEN contribution to the Aviation Project is differentiated material now available on Otto Lilienthal, Percy Pilcher and the Wright brothers. Modifying John's work sheets has prompted me to read R.G. Grant's 100 years of Aviation. "
<https://educationforum.ipbhost.com/topic/19-aviation/page/2/?tab=comments#comment-695>