Kevin said:

>I do wonder how common they really are.

while perhaps some are not a large percentage, they lack of one ISBN
per instance is very common.  Most modern novels apper in both bound
and paperback forms.

The percentage is large enough that the amount of hands on time to
clean up messes would be daunting.

On another topic:  I gather that Bibframe "works" are RDA works and
expressions.  If each translation is its own work, with its own record
(or whatever it is decided to call the work data), then shouldn't the
various translations be related?  Will Bibframe have an equivalent of

   __       __   J. McRee (Mac) Elrod ([log in to unmask])
  {__  |   /     Special Libraries Cataloguing   HTTP://
  ___} |__ \__________________________________________________________