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* [http://tonyforster.blogspot.com/2011/05/turtle-calculus.html Turtle calculus]
 
* [http://tonyforster.blogspot.com/2011/05/turtle-calculus.html Turtle calculus]
 
* [http://tonyforster.blogspot.com/2011/05/turtle-art-usb-serial-devices.html Turtle serial USB]
 
* [http://tonyforster.blogspot.com/2011/05/turtle-art-usb-serial-devices.html Turtle serial USB]
 +
* [http://tonyforster.blogspot.com/2011/05/graphing-pitch-and-volume.html Graphing pitch and volume]
    
An bringing it all together, [http://tonyforster.blogspot.com/2009/03/turtle-oscilloscope.html the Turtle Art Oscilloscope].
 
An bringing it all together, [http://tonyforster.blogspot.com/2009/03/turtle-oscilloscope.html the Turtle Art Oscilloscope].
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