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https://en.wikipedia.org/wiki/Blackboard#:~:text=A%20blackboard%20(also%20known%20as,or%20dark%20grey%20slate%20stone.
http://www.madehow.com/Volume-2/Chalkboard.html
https://www.rd.com/article/blackboards-green-not-black/
https://slate.com/human-interest/2014/10/a-history-of-the-blackboard-how-the-blackboard-became-an-effective-and-ubiquitous-teaching-tool.html
https://www.mentalfloss.com/article/504699/why-are-so-many-blackboards-green
https://resilienteducator.com/classroom-resources/the-history-of-the-classroom-blackboard/
https://askinglot.com/what-rock-is-used-for-blackboard
https://artfulparent.com/how-to-make-your-own-chalkboard/