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statumen
road construction
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Roman roads
- In road: The Roman roads
…courses were constructed: (1) the statumen layer 10 to 24 inches (250 to 600 mm) thick, composed of stones at least 2 inches in size, (2) the rudus, a 9-inch-thick layer of concrete made from stones under 2 inches in size, (3) the nucleus layer, about 12 inches thick, using…
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