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What to type for ISSN

The 13-digit barcode number of a periodical: 977, the first 7 digits of the ISSN, 2 variant digits (often 00), then the check digit.

Format977 + 7 ISSN digits + 2 variant digits (+ check)

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Anatomy

Start guardDigit 9 · L (odd parity) set9Digit 7 · L (odd parity) set7Digit 7 · L (odd parity) set7Digit 0 · L (odd parity) set0Digit 3 · L (odd parity) set3Digit 1 · L (odd parity) set1Centre guardDigit 7 · R set7Digit 8 · R set8Digit 4 · R set4Digit 7 · R set7Digit 0 · R set0Digit 0 · R set · check digit0End guard

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