Earth Magic

From Author Wars - https://authorwars.com/publications/earth-magic-269257.html

Overview:

Title: Earth Magic
Author: Alexei Panshin, Cory Panshin
Year: 1980
ISBN-10: 0417051905
Publisher: Magnum
Price: £1.40
Pages: 275
Binding: Paperback
Type: Novel
Title Reference: Earth Magic
Notes: First printing as per copyright page. Artist from signature on front cover and credit ("Cover Illustration") on back cover (which both just say Boris). $4.95 in Australia, $5.25 in NZ.