"978" at beginning just means "book"then countrypublisher or individual obtaining isbn (if not obtaining yourself and moving from one publisher to another you cannot re-use, for example, the createspace provided free isbn for amazon paperback cannot be transferred to Random House, lulu or Smashwords)Edition info (title, format, size, page count, etc.) It is absolutely an invalid isbn if you try to use same isbn on multiple book sizes ( or on paperback and ebook editions) even if you purchased yourself.*Check digit (the single digit at the end of the ISBN which validates the ISBN).
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