First Mention Ever of RuneQuest?

Amateur Press Association (APA) zines were the internet forums/social networks for the SFF nerds of the 1970s: each contributor would write a mini-zine (1 to 10 pages), send it to a central mailer who would collect all the mini-zines in order to produce a massive, 100+ pages zine that he or she would then post back (via snail mail!) to all the contributors. Alarums and Excursions was the main APA zine devoted to pen & paper role-playing games. In Alarums and Excursions issue No.26 (September 1977), Steve Perrin writes that he, alas, will have no time to participate in the APA zine scene any longer because he is

engrossed in RUNEQUEST, the role-playing game based on the world of Dragon Pass (from White Bear and Red Moon, Nomad Gods, etc.). About the ideas in this game, more later, but it has thoroughly eaten up my D&D time.

(...)

RUNEQUEST
The name of the game is my invention, and it describes the basic focus of the game. The characters must improve themselves so as to earn the Runes which will set them on the road to Herodom. (...) It is a long, hard trail to earn a Rune and that does not guarantee a Hero status. (...)
The other principal unique feature of the game is that everyone knows magic, or at least can learn it.

Note how Steve mentions that it is the ‘world of Dragon Pass’, rather than ‘the world of Glorantha’. Also of note (from another part of Steve’s contrbution): at the time flame wars were called fan feuds.