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Was doing some updating of my ultb tag in the usual way, by removing the tag from those books that have been added to LibraryThing by someone in the past year or so. Reflected on how sometimes those additions come as a surprise in the form of "I can't believe someone else has that book" and sometimes in the form of "I can't believe someone hadn't entered that book before now." Most recent culling had examples of both. But the observation made me wistful that I have just been removing the ultb tag from those books that have multiple copies. I wish I had thought to retag them as utbultb so I could see what happens over time to formerly ultb books.
Occasionally I'll find books that were ultb when I first entered them years ago but aren't anymore. I wish I had tagged them "First!" but that is a little undignified. ;-)