I just tested it and deleting works just fine.
close TB, then locate the TB profile. Inside it you
will find several files called abook.mab. If there is
a number after it [like abook-1.mab], then those are
the extra address books. Make sure that they're not
marked as read only. If they are, then change them,
open TB and try again. If it still doesn't work, then
close TB, and delete those files, but not the main book
[abook.mab]. Reopen TB, the books will still be there,
but the addresses gone. Try and delete the remainder
now. Did any of this work?
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