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https://wikidiff.com/chalkboard/blackboard#:~:text=As%20nouns%20the%20difference%20between,and%20subsequently%20erased%3B%20a%20chalkboard.
https://english.stackexchange.com/q/123500
https://www.askdifference.com/chalkboard-vs-blackboard/
https://en.wikipedia.org/wiki/Blackboard
https://hinative.com/en-US/questions/762533
https://pediaa.com/what-is-the-difference-between-blackboard-and-whiteboard/
https://polyvision.com/about/news/whiteboards-vs-chalkboards/
https://www.mentalfloss.com/article/504699/why-are-so-many-blackboards-green
https://slate.com/human-interest/2014/10/a-history-of-the-blackboard-how-the-blackboard-became-an-effective-and-ubiquitous-teaching-tool.html
https://courses.lumenlearning.com/atd-fscj-publicspeaking/chapter/blackboard-white-board-or-chalk-board/
https://www.lisarivero.com/2013/02/04/why-tomas-couldnt-erase-a-chalkboard-in-1904/
https://www.rd.com/article/blackboards-green-not-black/