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Provenance: Katie Boyd, University of Colorado at Boulder
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Provenance: Katie Boyd, University of Colorado at Boulder
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Provenance: Image from Microsoft Office clip art collection
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Provenance: Katie Boyd, University of Colorado at Boulder
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Provenance: Katie Boyd, University of Colorado at Boulder
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Provenance: Katie Boyd, University of Colorado at Boulder
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Provenance: Jennifer Taylor and Cheryl Manning
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Provenance: NCSE
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Provenance: Sean Fox, Carleton College
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