Note: The Encyclopedia of Science Fiction (SF-Encyclopedia.com) formerly identified two other names as probable pseudonyms of Hughes, E. R. Royce and Irving Heine. Each is known only for a single work that may be pseudonymous. Hughes used the name Ken Kester for non-genre "Westerns" whose publisher Herbert Jenkins "allowed time for longer, better-crafted work that appeared in hardback form". --SFE4 Ken Kester at WorldCat is directly linked above. As of July 2022, Library of Congress has identified most other pseudonyms and house names that SFE reports (17 of 19 other than Kester). WorldCat pages for all those author names are linked from a list in the right margin of its page for Denis Hughes. Two others are undifferentiated names at WorldCat: G. R. Melde and William Rogersohn. (There are 20 Alternate Names for Hughes at ISFDB, where "Rand Le Page" and "Rand la Page" are distinct.)