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Roman roads were usually constructed of a layer of dry sand; a layer of medium-to-large stones called the statumen; a layer of small gravel mixed with cement called the rudus; a layer of sand mixed with cement called the nucleus; and a top layer of flat, wide stones called the summum dorsum. | Science Of The Universe

Roman roads were usually constructed of a layer of dry sand; a layer of medium-to-large stones called the statumen; a layer of small gravel mixed with cement called the rudus; a layer of

Science Of The Universe. Science Of The Universe · Original audio. Roman roads were usually constructed of a layer of dry sand; a layer of medium-to-large stones called the statumen; a layer of small gravel mixed with cement called the rudus; a layer of sand mixed with cement called the nucleus; and a top layer of flat, wide stones called the ...

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