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I have organized many of my worksheets into various workbooks. Most of these you can locate at [url]http://tube.geogebra.org/dochopatsbu[/url]. I have a few worksheets I have created specifically for presentations about GeoGebra. My presentations, typically with working links, are available by following the link in the list of presentations at [url]https://sites.google.com/site/drhopkinsbackground/[/url] .