ISO 1681:1973: Information processing--Unpunched paper cards--Specification.ISO 1682:1973: Information processing--80 columns punched paper cards--Dimensions and location of rectangular punched holes.
ECMA-10: ECMA Standard for Data Interchange on Punched Tape.
ITU-T Recommendation F.1: Operational provisions for the international public telegram service, Division B, I. Morse code.