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    Carbon Capture and Sequestration, May 9

    $60.00
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    Chocolate: Food of the Gods

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    Chocolate: Food of the Gods, March 11

    $60.00
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    Cities of Silver: A Survey

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    Cities of Silver: A Survey, September 26

    $60.00
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    Cities of Silver: Santiago de Querétaro, San Miguel de Allende, and Guanajuato

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    Clean and Green: Getting the Trash out of Buffalo Bayou

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    Clean and Green: Getting the Trash out of Buffalo Bayou, April 1

    $60.00
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    Deep Seabed Mining, October 17

    $30.00
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    Deposit – Cities of Silver: Santiago de Querétaro, San Miguel de Allende, and Guanajuato

    $1,000.00
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    Dixie Friend Gay Studio Visit

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    Double Occupancy Paid in Full – April in Washington, D.C.: A Study in Contrasts

    $3,200.00