New collection of Aldiss essays

The Jonbar Point: Essays from SF Horizons by Brian Aldiss will be released by Ansible Editions on September 1, with a new introduction by Christopher Priest.
The Jonbar Point collects, for the first time, two major essays on science fiction which Brian Aldiss published in the two issues of SF Horizons
“Judgement at Jonbar” (1964) is a lengthy analysis on several levels of Jack Williamson’s pulp-era classic The Legion of Time, which gave SF the term “jonbar point” – where alternative timelines diverge. This essay is described in the Encyclopedia of Science Fiction as “one of the most penetrating studies yet written about a pulp-sf novel”.

from “New Collection of Aldiss Essays from Ansible Editions”, Mike Glyer, File 770