We've all had to do it at one time or another... track down a novel, short story, or poem for which the customer knows neither the title nor the author.
Each of us has our "bag of tricks" to take to the problem. The Library of Congress has compiled resources online, in the library community, and in the library and posted them on the site Lost Titles, Forgotten Rhymes.
Check it out and add to your arsenal!
And if you have any favorite resources they've missed, you can send them the Library's Digital Reference Team.
-- John L.