Construction continued up to the Ming dynasty (1368–1644), when the Great Wall became the world's largest military structure. Its historic and strategic importance is matched only by its architectural ...

Crib retaining walls are a form of gravity wall. They are constructed of interlocking individual boxes made from timber or pre-cast concrete. Then, the boxes are filled with crushed stone or other ...

This pocket of biodiversity wasn’t always here. In 2008 Gresham had excavated an elaborate maze of berms and canals, known as the Columbia Slough Regional Water Quality Facility, to capture the ...

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