The World Inside

From Author Wars - https://authorwars.com/publications/the-world-inside-50477.html

Overview:

Title: The World Inside
Author: Robert Silverberg
Year: 1971
Publisher: Doubleday
Price: $4.95
Pages: 201
Binding: Hardcover
Type: Novel
Title Reference: The World Inside
Notes:
"First Edition" so stated. Gutter code "M22" on page 201 indicates a printing in 1971 May, with usual 6-week lead time gives a July publication month Contento1 lists this as a collection