If your library has a directory in the reference section called Essay and General Literature Index , which was begun in 1990 and is published every two years by . Wilson, you can use it to help locate places to submit your essays by looking up subject headings. For instance, if you look up “trees,” you will find some listings about essays concerning trees in publications you might not have heard of such as American Forests . The Reader”s Guide to Periodical Literature , also published by . Wilson, is in every library”s reference section. Here, too, you can use a subject head. However, it is hard to tell an essay from an article by this index”s descriptions.