In the 50s and 60s, a substantial portion of Robert Silverberg's work was published under other names. In some cases, this was because he was so prolific that magazine editor wished to conceal the fact that several stories in each issue were by the same writer. In other cases, the work was in genres outside science fiction, and using his real name could have harmed his reputation in the SF community. In any case, here's a listing of the names used.
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