Early Card Punch Machines
What is the history of punched cards? When did they stop being
Punched card - Wikipedia
Punch card computers hi-res stock photography and images - Alamy
Early Card Punch Machines
Making Sense of the Census: Hollerith's Punched Card Solution
The punched card
The IBM 029 Key Punch
Douglas W. Jones's punched card index
Tabulating Machines
Punch card machine hi-res stock photography and images - Alamy
ICL Hand Punch Card Machine from 1969 – historictech