• The 1984 Tor edition of "The Last Master" is an unstated expanded and revised edition of "The R-Master"
• The copyright page of "The Last Master" states "Copyright © 1984 by Gordon R. Dickson"
• "First TOR printing, February 1984", no number line.
• Cover art is credited to Mattingly on the copyright page (without the "B."); cover is also signed [some copies have 'shifted/cropped' artwork that cuts off the signature]
• ©1984; an expanded and revised edition of The R-Master, not stated
• The Canadian ISBN is also on the cover, spine and copyright page: 0-812-53563-4.
• $3.50 in Canada.
