>  "Real" libraries probably work with
> scanners rather than manually typing the ISBN.

Heh.  I was attaching bar codes to new books at the school
library today.  Policy is to cover up the ISBN barcode with
the library barcode; it helps prevent the desk workers from
scanning the wrong thing.  The books I was working with didn't
seem to have a barcode except for the one on the back cover or
dust-jacket.  Must be a real PITA if it ever falls out of the
system and you need to put it back in.

("real" libraries need a unique barcode per book, rather than
a barcode per title, to cover the very common "multiple copies
of the same book" issue.)

BillW

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