Punched cards

https://www.jkmscott.net/data/Punched%20Cards.html

https://homepage.divms.uiowa.edu/~jones/cards/collection/i-program.html

https://www.si.edu/spotlight/punch-cards/punch-cards-data-processing

https://www.ibm.com/ibm/history/exhibits/vintage/vintage_4506VV2159.html

https://www.digibarn.com/collections/small-items/punchcard-printing-plate/index.html

Heide, Lars. Punched-Card Systems and the Early Information Explosion, 1880-1945. Baltimore: JHU Press, 2009.