As you search for research and critical materials, you should always begin with resources specific to English Literature. These databases and collections provide access to articles, handbooks, reviews, and other topical material. If the article you are looking for is not available at Reed, you can request it from Interlibrary loan.
The library has a number of important books of literary criticism and critical theory. Try searching the library catalog (and WorldCat) with the subject heading "Short stories, American History and criticism" to find books and ebooks on American short stories. Here are a few books and ebooks to get you started.