Opus 100

From Author Wars - https://authorwars.com/publications/opus-100-25093.html

Overview:

Title: Opus 100
Author: Isaac Asimov
Year: 1969
ISBN-10:
Publisher: Houghton Mifflin
Price: $5.95
Pages: xv+318
Binding: Hardcover
Type: Collection
Title Reference: Opus 100
Notes:
"First Printing" on copyright page. [Currey] Month from amazon.uk, which lists an ISBN 0-395-07351-0 but it was not in use in 1969 Price from AbeBooks Page numbers from Archive.org copy of third printing.