"It's Been a Long, Long Time ... "

From Author Wars - https://authorwars.com/books/its-been-a-long-long-time-847692.html

Overview:

Title: "It's Been a Long, Long Time ... "
Author: John W. Campbell
Year: 1966
Type: Essays

Editions/Publications:

Unknown. Analog Science Fiction -> Science Fact, February 1966 (Unknown, John W. Campbell, Condé Nast, $0.50, 164 pages, digest, MAGAZINE)