Assertion: sodium carbonate | /r/HasProperty | produced per ton of trona ore
Facets:
Source sentences:
text: As stated above, recovery of sodium carbonate (usually expressed as tons of sodium carbonate produced per ton of trona ore) has fallen as the higher quality reserves have been mined.
text: As stated above, recovery of sodium carbonate (usually expressed as tons of sodium carbonate produced per ton of trona ore) has fallen as the higher quality, more readily accessible reserves have been mined.