Where, oh where is GH1975?

A couple weeks ago (at most) I added a new hymnal GH1975, the Stamps-Baxter Gospel Hymnal. Today I went in to add some content, and it's gone. It's not in My Hymnals (where it was not long ago), and it's not in the database as a whole, but when I try to readd it as a New Hymnal, I'm told there's already a hymnal in the database with that HymnalID. What gives? Its companion Volume II is there. Worried.