[Web4lib] Conversion between ISBN-10 and ISBN-13

[Drew, Bill]

This still doesn't make sense to me.   Since ISBNs are assigned by the
publishers to books, why would there be any conversion of 10 digit
numbers to 13 digits?  The books are already published.  Why not just
assign 13 digit numbers after a certain date and leave it at that?  Why
convert 10 to 13 digit?  Can't systems simply handle both?  All of this
probably sounds very naive on my part.

Bill Drew
drewwe at morrisville.edu