Since the appearance of the first science fiction magazine in 1926, thousands of short stories have been published in periodicals devoted to the genre. These stories cover a wide range of subjects, from spacecraft to the human condition, and feature little-known authors as well as masters like Ellison and Asimov. In the past, finding which issue of what magazine ran a certain story was nearly impossible. This much-needed reference tool provides valuable assistance in the daunting task of locating short stories published in science fiction magazines, providing exhaustive indexes to magazines, authors, and titles, allowing a variety of options for research on 34,000 stories appearing in nearly 5,000 issues of 133 genre magazines. Stories from all major American publications, as well as from several minor periodicals, are indexed. Also included is an appendix of the best known and most prolific contributors, giving the titles of all their stories in this work (necessary because the huge author index does not show titles). A guide to how to use this book clarifies its features for the researcher.