Library of Congress 50,000 Bibliographic Sources?

[Asa]

I appear to have several listings on Ancestry for a relation, Blanche Emily Walker Bates Swingler, in this but am not a Worldwide Subscriber - does anyone know what it is and what I might find if I bought some access? Is it just as it sounds, a collection of various sources?

[Asa]

Ah ignore this - looking at similar English directories, I think it just picks a couple of the names that appear on the page of the book, so there probably aren't any that relate to Blanche.