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https://en.wikipedia.org/wiki/Spirit_duplicator
https://en.wikipedia.org/wiki/Duplicating_machines
https://www.seattlepi.com/news/article/The-ditto-is-dead-and-few-mourn-its-passing-1098579.php
https://www.nytimes.com/2004/12/08/nyregion/school-blackboards-are-turning-white-and-interactive.html
https://www.treehugger.com/technology-revolutions-that-are-now-relics-4869033
https://www.courant.com/opinion/op-ed/hc-op-barreca-the-old-days-werent-all-good-0203-20170201-column.html
https://www.tetongravity.com/forums/archive/index.php/t-151460.html
https://books.google.com/books?id=k9K8tuKdGNAC&pg=PA159&lpg=PA159&dq=blackboard+and+ditto+machines&source=bl&ots=viSfZMZTf3&sig=ACfU3U3e-CIjDfcirEjXr1XGx1zxyvzIlQ&hl=en&sa=X&ved=2ahUKEwjS78uR1q7uAhVmRzABHRLpBKwQ6AEwGXoECCoQAg
https://books.google.com/books?id=ut6CENhtyDoC&pg=PA210&lpg=PA210&dq=blackboard+and+ditto+machines&source=bl&ots=IDl7WaAZgM&sig=ACfU3U2kqMcCAQzhpdvtoCLkD-7N36_L_w&hl=en&sa=X&ved=2ahUKEwjS78uR1q7uAhVmRzABHRLpBKwQ6AEwGnoECCsQAg
https://boards.straightdope.com/t/what-were-those-terrible-tissue-paper-copiers-called-in-the-1970s/620556
https://www.print.iastate.edu/AboutUs/History/
https://books.google.com/books?id=4wb3IHdIjzIC&pg=PA12&lpg=PA12&dq=blackboard+and+ditto+machines&source=bl&ots=cfnktcSnsQ&sig=ACfU3U3iUdGj_JkbSQAoyYWCSudkJ7LWTQ&hl=en&sa=X&ved=2ahUKEwjS78uR1q7uAhVmRzABHRLpBKwQ6AEwHXoECCkQAg