The Mystery of Arthur Gordon Pym

"Devised and introduced by Basil Ashmore". Table of contents also contains under The Narrative of Arthur Gordon Pym of Nantucket "Introduction by Basil Ashmore" (p. 7) (actually titled "Introduction" and dated June 1960), and "Note" (p. 74) and under The Sphinx of the Ice-Fields "Introduction" (p. 79) and "Editorial Footnote" (although the footnote is actually titled "Editorial Postscript") (p. 191). Copy that this was verified against had no cover, so retaining other sources for price. Data from the Analog review in November 1961, the Library of Congress and Worldcat.