If we’re going by age of article, (1997) is probably closer: http://ftp.gnu.org/gnu/units/ http://ftp.gnu.org/gnu/units/ Though, back then, most GNU utils wer

If we’re going by age of article, (1997) is probably closer: http://ftp.gnu.org/gnu/units/ http://ftp.gnu.org/gnu/units/ Though, back then, most GNU utils were copies of older unix stuff, so (1980) or even (1960) wouldn’t surprise me.