Assertion: road's surface | /r/HasProperty | gravel
Facets:
Source sentences:
text: At the time, the country had about 2.2 million miles (3.5×10 ^ 6 km) of rural roads, of which a mere 8.66% (190,476 miles or 306,541 kilometres) had "improved" surfaces: gravel, stone, sand-clay, brick, shells, oiled earth, etc.