Unwin Derick <br/><br/>
Leyes del movimiento de Newton 
Derick Unwin. 
 - Madrid  Ediciones del Castillo  c1970. 
 - 95 p. 
 - Serie Didáctica programada .
<br/><br/> Contains tests and answers.  Translation of : Newton's laws of motion. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Motion.--Programmed texts.