After World's End / The Floating Robot

From Author Wars - https://authorwars.com/publications/after-worlds-end--the-floating-robot-485428.html

Overview:

Title: After World's End / The Floating Robot
Author: Jack Williamson, David Wright O'Brien
Year: 2014
ISBN-10: 9781612872223
Publisher: Armchair Fiction
Price: $12.95
Pages: 208
Binding: Trade Paperback
Type: Omnibus
Title Reference: After World's End
Notes: Data from publisher's Web site. Data from Armchair Fiction as of 10/27/14. After World's End cover reprinted from Wesso's for the novel's first appearance in Marvel Science Stories, February 1939. The Floating Robot cover reprinted from McCauley's for the novel's first appearance in Fantastic Adventures, January 1941.