Assertion: paper | /r/CapableOf | remain expensive
Facets:
value: in book-sized quantities
type: OTHER
value: through the centuries
type: TEMPORAL
Source sentences:
text: Although cheaper than vellum, paper remained expensive, at least in book-sized quantities, through the centuries, until the advent of steam-driven paper making machines in the 19th century, which could make paper with fibres from wood pulp.