PETER RYAN / SCIENCE PHOTO LIBRARY PETER RYAN / SCIENCE PHOTO LIBRARY
Bar code. Bar code label on a library book. The bar code contains information about the book. The bar code can be 'read' by a computer using a light source. If the computer is unable to read the code, the information can be manually entered into it using the number code below the bar code. This computer storage of information makes stock control easier. Photograph of a Swedish library book.
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