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| Hydrostone: |
gypsum cement, manufactured by United States Gypsum, Chicago, IL 60606, USA. |
| Mortor Color: |
concentrated dye, manufactured by Solomon Grind-Chem Service Inc., Springfield, IL 62705, USA. |
| Specimen Boxes: |
clear, plastic, rectangular containers with friction fitting lids, manufactured by Tri State Molded Plastics, Inc., Dixon, KY 42409, USA. |
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