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Descriptions of over 260 Codes. Peterborough, N.H.: Helmers Publishing. ISBN 978-091126112-7. Alfred, Randy (26 June 2008). "June 26, 1974: By Gum! There's a New...45 KB (5,369 words) - 13:53, 19 May 2024- To Bar Codes: A 200-year journey. Peterborough, N.H.: Helmers. ISBN 9780911261127. Varchaver, Nicholas (31 May 2004). "Scanning the Globe". Fortune. Archived...94 KB (8,256 words) - 04:59, 21 May 2024
