Masters of the Vortex

From Author Wars - https://authorwars.com/publications/masters-of-the-vortex-21685.html

Overview:

Title: Masters of the Vortex
Author: E. E. 'Doc' Smith
Year: 1970
Publisher: Pyramid Books
Price: $0.75
Pages: 191
Binding: Paperback
Type: Novel
Title Reference: Masters of the Vortex
Notes:
- Gnome Press edition published 1960
- Pyramid edition published August, 1968
- Second printing February, 1969
- "Third printing March, 1970"
- The #N2230/$0.95 & #N3000/$0.95 editions also say they are 3rd printings, this one is correct. The proof is that the price is 75¢.
- No number line
- Copyright 1960 Edward E. Smith, Ph.D.
- (original title: The Vortex Blaster) on title page, copyright page and front cover.
- "Cover: Jack Gaughan" on back cover, the artwork also has his initials
- Printed in the US