Twentieth-Century American Science Fiction Writers

From Author Wars - https://authorwars.com/publications/twentieth-century-american-science-fiction-writers-276367.html

Overview:

Title: Twentieth-Century American Science Fiction Writers
Author: David Cowart, Thomas L. Wymer
Year: 1981
ISBN-10: 0810309181
Publisher: Gale Research Company
Price: $124.00
Pages: xv+306+ix+346
Binding: Hardcover
Type: Non-fiction
Title Reference: Twentieth-Century American Science Fiction Writers
Notes: Two-volume set, not available separately.
Volume 1 contains entries A-L. Volume 2 contains entries M-Z + appendixes and Cumulative index.
According to an advertisement in Locus #245 (June 1981), the price is $116.00 for the set (no price on either book) and that the page count is 750 pages.
Volume 1 is paginated xv+306, volume 2 is ix+346 pages.
#8 in the "Dictionary of Literary Biography" series.
No dj on verification copy.
See here for cover of Volume 2.

Archive.org copy uploaded in December of 2018 only includes M-Z.