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allowing the abacus to lie flat on student desks
Single edge razor blades
maintenance-free construction
Carry handle folds neatly into body space allowing the units to be stacked
GEO-logic Hardness Set Fraction allowing the abacus to lieA Complete Kit to Communicate the Concept of Hardness in Minerals Developed jointly by experienced educators and Ward's staff geologists. Classroom tested for dependability. Designed to save valuable planning and preparation time. Students will understand the differences in mineral composition when they use our GEO logic set to investigate variations in mineral hardness. A teacher's guide and student copy masters are included for the following
US$ 25.00
US$ 22.50
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US$ 60.00
US$ 100.00
US$ 70.40
