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Slide 19
    TEXT VERSION OF SLIDE:

    Type: Picture Slide
    Content: Includes photo of Portland cement operations.

    Speaker Notes: The manufacture of Portland cement and bricks requires that the raw material used, including silica, be reduced in size. The raw materials are crushed into small stones, then ground into a fine powder. The result is that a great amount of silica dust is created and becomes airborne. Exposure to the dust continues during further handling and processing of the material.