The Planet Killers

From Author Wars - https://authorwars.com/publications/the-planet-killers-346800.html

Overview:

Title: The Planet Killers
Author: Robert Silverberg
Year: 2011
ISBN-10: 9781601253361
Publisher: Paizo Publishing
Price: $15.99
Pages: 285+[19]
Binding: Trade Paperback
Type: Omnibus
Title Reference: The Planet Killers
Notes:
- On copyright page:
  - "cover illustration by Kieran Yanner"
  - "Stories originally appeared in the Ace Double novel series"
  - "July 2011"
  - ISBN
- $15.99 price and ISBN on back cover.
- Published by Paizo Publishing for Planet Stories. Following page 285 are 19 un-numbered pages with information about other Planet Stories publications.
- Prior to publication in March 2011 Amazon.com showed publication date of 2011-03-15. As of 2020-01-18 Amazon.com shows publication date of 2011-10-18.