This claims to be a version from 1980. It appears to have scans of the illustrations from 1980, but retyped text.
See Good's bibliography:
391. "The human preserve" (an invited contribution to a symp. on extraterrestrial life held by the Institute of Biology and the British Interplanetary Society, May 1964), JRNSS (1964), 370-373; and Spaceflight 7 (1965), 167-170 and 180 (See #476)
[JRNSS = J. Royal Naval Science Service]
476. "Life outside the earth", The Listener 73 (June 3, 1965), 815-817. Japanese translation in The Japan Tiles Weekly, Aug. 28, 1965, pp. 14-15. (See #s 391, 597, and 644.)
597. "The Cosmic Club", Context 2 (1968), 2-9 and 36. (See #s 391, 476 and 644.)
644. "The chief entities", Theoria to Theory 3 (April 1969), 71-82. (See #s 391, 476, 597 and 1298)
1298. "The chief entities", a shortening of #644 for Cosmic Search 2, No. 2 (Spring 1980), 13-17.
Supposedly, the Listener has been digitized, but it's probably not available at many American universities.
This claims to be a version from 1980. It appears to have scans of the illustrations from 1980, but retyped text.
Thanks. That's sufficient for my curiosity: Good lays out the argument for lots of aliens (which is cogent enough and time has vindicated various beliefs such as planets being common), notes that galactic colonization is easy and highly certain on astronomical timescales, that there must be a stable governing structure (the Chief Entities, who may or may not be FAIs), and argues that the reason for the Great Silence is the 'zoo hypothesis' (j...
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