Whether you are just starting to consider submitting your work or are submitting regularly, part 1 of this article by Becky Tuch gives a reviewers inside look at the most well-done journals and lit mags. It includes links to each with a brief description. It also includes information on The Review Review, which is a valuable resource for detailed reviews of many others publications, as well as access to calls for submissions and other writer resources.
You can read part 2 here: Your Lit Mag Starter Kit, Part II: Celebrating Quirk!
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