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https://resilienteducator.com/classroom-resources/the-history-of-the-classroom-blackboard/#:~:text=In%201801%2C%20the%20rather%20obvious,slate%20on%20the%20classroom%20wall.
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
https://www.clarus.com/history-of-the-blackboard/
https://daily.jstor.org/how-blackboards-transformed-american-education/
https://blogs.ubc.ca/etec540sept12/2012/10/28/the-history-and-future-of-the-chalkboard/
https://www.familytreemagazine.com/history/history-matters-chalk/
https://www.indiatoday.in/education-today/featurephilia/story/blackboard-digital-board-343947-2016-09-29
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5082488/
http://www.historyofpencils.com/writing-instruments-history/blackboard-chalk-and-whiteboard-pen-history-and-future/
https://www.rd.com/article/blackboards-green-not-black/