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https://resilienteducator.com/classroom-resources/the-history-of-the-classroom-blackboard/
https://en.wikipedia.org/wiki/Blackboard
https://en.wikipedia.org/wiki/Blackboard_Inc.
https://slate.com/human-interest/2014/10/a-history-of-the-blackboard-how-the-blackboard-became-an-effective-and-ubiquitous-teaching-tool.html
http://www.whoinvented.org/who-invented-blackboard/
https://www.clarus.com/history-of-the-blackboard/
https://www.blackboard.com/about-us
https://www.onestopergonomics.com/pages/about_chalkboards
https://www.familytreemagazine.com/premium/history-matters-chalk/
https://www.whoinventedit.net/who-invented-the-chalkboard.html
https://blogs.ubc.ca/etec540sept12/2012/10/28/the-history-and-future-of-the-chalkboard/
https://www.theatlantic.com/technology/archive/2016/10/theres-no-erasing-the-chalkboard/503975/