Assertion: memorial's foundation | /r/HasProperty | concrete
Facets:
Source sentences:
text: The Memorial is anchored in a concrete foundation, 44 to 66 feet (13 to 20 m) in depth, constructed by M. F. Comer and Company and the National Foundation and Engineering Company, and is encompassed by a 187-by-257-foot (57 by 78 m) rectangular granite retaining wall measuring 14 feet (4.3 m) in height.