can't Add to Collection

I created a folder IE-1 as a subfolder of Library. I used books.google, and two book references were entered into IE-1. However, a third book doesn't get placed into IE-1, even though the third book appears in the right column. I highlight IE-1 in left column, then check box beside reference to be added, then click Add to Collection, which offers IE-1 -- but book-3 does not get added. I'm stuck.
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