http://www.jsoftware.com/jwiki/Essays/Check_Sums now contains UPC, ISBN-10, and ISBN-13 as well as the previously discussed SEDOL and CUSIP.
You know, before the Internet (or even before the Wikipedia), one'd have a hard time finding the information needed to implement what's in the essay. ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
