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- Clay for petroleum refining, chemically processed (1)
- Clay, ground or otherwise treated (2)
- Graphite, natural: ground, pulverized, refined, or blended (7)
- Perlite, aggregate or expanded (4)
- Vermiculite, exfoliated (1)
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- Foundry facings, ground or otherwise treated (3)
- Roofing granules (2)
- Slag, crushed or ground (16)
