Brilliant, brilliant, brilliant! THANK YOU. 8.64's new catalog features simplified this for me so very significantly.
I can tell at a glance which books I have read, own but have not read, have a sample for (so I know that they are /were e-available) and which are not yet e-available -- and, best yet, I can do it with a custom "Status" column I was already maintaining. That allowed me to delete tags for the same information, which were duplicative additional work and created Genres I didn't want anyway. Thank you.