File 12697 is a 6.9MB PowerPoint Uploaded:
Jul28 08 https://serc.carleton.edu/download/files/12697/tewksbury_concept_sketches_tal.ppt
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Workshop program https://serc.carleton.edu/NAGTWorkshops/geomorph08/workshop_program.html
Provenance Barb Tewksbury, Hamilton College
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Tewksbury concept sketches talk