Assertion: oak's wood | /r/HasAspect | great value
Facets:
value: at one time
type: TEMPORAL
Source sentences:
text: The wood has great value and at one time, the bark of the chestnut oak, because of its high volume of a compound called tannin, was vital in the process of tanning leather, according to the "National Audubon Society Field Guide to Trees: Eastern Region.