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Workers have shoveled earth over cement slab and now are watering down fill to make it settle. John Fredrick well project, Charles County, Maryland, near La Plata, Maryland. Sourced from the Library of Congress.

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Workers have shoveled earth over cement slab and now are watering down fill to make it settle. John Fredrick well project, Charles County, Maryland, near La Plata, Maryland. Sourced from the Library of Congress.

More