2354 - HARDNESS COLLECTION MOUNTED ON A CARD - 9 SPEC.
2354 - HARDNESS COLLECTION MOUNTED ON A CARD - 9 SPEC.
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2354 - HARDNESS COLLECTION MOUNTED ON A CARD - 9 SPEC.

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This is the Traditional Scale of Hardness Collection of 9 specimens 1” X 1”. Grades 6-12. Geology is a required STEM subject.