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Where Theory Meets Chalk, Dust Flies - The New York Times
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Are Chalkboards Still Used in Schools? | Whiteboards & Pinboards
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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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How to Choose a Chalkboard for Your Home — Hoopla! Letters
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Chalkboards, Projectors, and Other Things Schools No Longer Use
The Art of Mathematics in Chalk | Scientific American
5 Reasons Why Some Educators Still Use Chalkboards - Polyvision
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5 Reasons Why Some Educators Still Use Chalkboards - Polyvision
On Blackboards
