Poetry? Just give me the 811...
Library of Congress has a great guide for finding poetry criticism.
SEARCH STRATEGIES (from the LOC site)
"Criticism of poems can often be found through by conducting keyword searches of search engines such as Google and Yahoo! Using keywords such as a poem's title along with criticism, analysis, or introduction frequently will return sites that provide explications of the poem. There also exist Web portals such as the Internet Public Library's Literary Criticism collection that may lead you to criticism of individual poems."
800's are where books about literature live...and the numbers in the tens and the ones column get more and more specific about where the books came from and what they are about. And yes, inquisitive student, fiction is literature, but not generally found in the 800's...many libraries split out fiction to its own section. Just like we do. We even get a little crazy and have a whole separate section dedicated to Science Fiction and Fantasy Fiction. I know, crazy. But that's a different class.