Answer: ISBNNUMBER

The crossword puzzle answer ISBNNUMBER has 2 different clues. We have seen it appear in puzzles 2 times.

Crossword puzzle clues for ISBNNUMBER:

• Digits on the back cover
• Bibliographic identifier

Usage in crossword puzzles

• Washington Post Daily Crossword Puzzle - 2002-03-16
• Washington Post Daily Crossword Puzzle - 2005-02-03

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