What's up with having different ISBN's for what appears to be the exact same book? For example: - 13: 9780930467944 - 0930467949 In this example, ISBN 13: 9780930467944 is required for a course, but Abebooks.com is listing both of the above ISBN's as being one-and-the-same book. You can see it at the Abebooks website at this link: 9780930467944 - Rite of Christian Initiation of Adults, Study Edition: Complete Text of the Rite Together with Additional Rites Approved for Use in the Dioceses of the United State... - AbeBooks Are they the same?
As far as I can tell (and I'm not certain) one is the "Study Edition" and one is the "Student Edition." Different edition require different ISBN numbers.
When a book gets its ISBN number, it gets a 10 digit and a 13 digit one. I'm not sure why, but they both refer to the same book. I confirmed this by checking the ISBNs on my book - which of course identify the same book: ISBN-10: 1467933864 ISBN-13: 978-1467933865
Ten digits if published before 2007; 13 after. The extra 3 digits are a prefix. Books with a 10-digit number can get a 13-digit number conversion calculated and assigned. Thus, they carry both.
