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Economy Duro-Slate Chalkboard - Black or Green - Many Sizes - 1/4" Hardboard Backing | Learner Supply
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Amazon.com : Small Slate Chalkboard Mini Chalk Board Small Chalkboard with Frames Mini Chalkboard Signs School Supplies for Classroom Party Home Office Wedding Birthday Decoration, 5 x 4 Inch (12 Pcs) : Office Products
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Blackboards from 1917: Emerson High School in Oklahoma City uncovers slate blackboards with lessons frozen in time.
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