Acknowledgments
“The Incomplete Enchanter” (including: “The Roaring Trumpet” and “The Mathematics of Magic”) copyright © 1941 by Henry Holt and Company. A somewhat different form of this novel appeared in the May and August 1940 issues of Unknown, copyright © by Street & Smith, Inc.
“The Castle of Iron” copyright © 1941 by Street & Smith, Inc., for Unknown, April 1941.
“The Wall of Serpents” copyright © 1955 by Future Publications Inc.
“The Green Magician” copyright © 1954 by Galaxy Publishing Corporation.
All copyrights renewed by L. Sprague de Camp, 1967-1982.