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A book that arrives as a file often has no identifier to ask about, only a title and perhaps a name. `bibfetch search --title T [--author A] [--limit N]` asks Open Library's index which books it has under those, and Google Books only when Open Library has nothing, and prints one record per candidate in the order the register gave them. From Rust, `bibfetch::search(&agent, title, author, limit, attempts)`. Each candidate is one edition. The index answers with works and, asked for `editions.*`, names the edition of each that best matches; the ISBN, publisher, language, year and cover come from that edition, the title, authors, subjects and length from the work. The work's own ISBN list mixes editions: the first War and Peace work lists four, while the edition matched is a 1917 printing with none. `id` is the first ISBN whose check digit agrees, in thirteen digits, thirteen-digit entries taken first. A candidate with none is named by the register's key: `olid` (OL…M for the edition, OL…W for the work when no edition was named) or `googlebooks` (a volume id). Google's `OTHER` shelfmarks are never read as ISBNs. `cover_id` keeps the meaning it has in a lookup record: the edition's own first cover, taken from `editions.cover_i` and only when the record names that edition. The work's `cover_i` and `cover_edition_key` are not asked for. A work with no edition named, and every Google Books candidate, has none. Open Library having nothing stands when Google Books is down; both down is exit 69. Exit 0 a candidate, 1 none, 65 an empty title. The retrying GET that lookups use is now `ask::get`, shared by both, and no longer sleeps after its last attempt.