Assertion: roofing slate | /r/HasProperty | over 8 million square feet
Facets:
Source sentences:
text: The Slatington Slate Trade report for January 4 of 1880 showed that quarries in the town of Slatington alone had shipped 81,402 squares of roofing slates (over 8 million square feet) as well as 40,486 cases of school slates and 243 cases of blackboards.