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Reference

Mohs hardness scale.

  • Authors : Reaser, Donald F.

Subjects: Hardness

  • Source: Salem Press Encyclopedia of Science, 2023. 1p.

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Reference

Hard water.

  • Authors : Ungvarsky, Janine

Subjects: Bicarbonate ions; Sulfates; Chlorides

  • Source: Salem Press Encyclopedia of Science, 2022. 3p.

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Reference

Graphene.

  • Authors : Goldmeier, Harold, EdD

Subjects: Crystal structure; Carbon; Graphene

  • Source: Salem Press Encyclopedia of Science, 2023. 3p.

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Reference

Covalent solids.

  • Authors : Parodi, George A.

Subjects: Covalent crystals

  • Source: Salem Press Encyclopedia of Science, 2022. 3p.

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