Wow! Thank you so much! It worked! I don’t think that I fully understand how or why, but I went into the data file for the most recently working version of my library and into the pdf folder (not the most recently recovered version because the last modified dates are all the same, so I couldn’t tell which things I had added just before it crashed) and deleted what was listed for the day it crashed (4 items). I then tried opening the corresponding version of my library and it opened! Everything in my library is intact including my groups and the citations for those 4 items; I will just have to delete and reattach those 4 pdfs. A bit scary to do but somehow it worked!
Thanks!
~Riva