Understanding the Bar Code Structure is a description of the structure of the standardized bar code used by many libraries for both their patrons and their materials. It resides on the website of JerseyCat, New Jersey’s nicely named “statewide virtual catalog and interlibrary loan system.”
Of added interest is the inclusion of the formula for calculating the check digit.
Even if you never need this type of information for your job, it is good to know the basic philosophy behind the bar code structure.
