Close-up of the Lewis and Clark salt cairn at the Seaside where the expedition produced sorely needed salt from ocean water. A fire was prepared in the oven-like compartment to heat salt water to evaporate in the kettles set atop the cairn. Lewis and Clark National Historical Park.
<ul><li>Keywords: structure; Exploration(NPS History Collection Themes)</li></ul>
Jack E. Boucher
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