• Elements
  • Designs
  • Design topics
  • Element topics
  • Boards
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Examining soil from bored well hole. The boring continues until water bearing sand is reached. Safe well demonstration, Ridge, Saint Mary's County, Maryland. Sourced from the Library of Congress.

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Examining soil from bored well hole. The boring continues until water bearing sand is reached. Safe well demonstration, Ridge, Saint Mary's County, Maryland. Sourced from the Library of Congress.

More