Topical Index to Spurgeon's Sermons?

Liam

I saw a topical index to Spurgeon's sermons referenced in a book I own (a similar topical index, but one for the puritans). Has anyone heard of this? Better yet has anyone used one? I cannot seem to find a topical index for Spurgeon, only title and scripture indexes.

Side note, has anyone heard of such a thing for Luther or Augustine? 

Thnks all!

Liam

Never mind! Just found it! 

If anyone knows of one for Augustine, Luther, Calvin, or the new Yale Edwards collection please reply!

Thanks!