shalom,i would like to bring 2 scholarly Facebook groups to the attention of members: Hebrew Printing and bibliography (https://www.facebook.com/groups/1656454634602015/?ref=bookmarks) and Hebrew Codicology and Paleography: https://www.facebook.com/groups/375003239611/?ref=bookmarksboth groups are fairly active. the first is a good place for bibliographic assistance when working with highly obscure volumes. the second is a very useful resource for obtaining help localizing, dating and transcribing single leaves of manuscripts and for dating of sifrei torah, and megilot.