Spock-centric Gen Fics (TOS)

[wwanda.livejournal.com]

I'd love to read some well-written Spock-centric TOS fic without any romance in the plot - does anyone have any recs (or even just any idea where I could look, besides AO3)? I'd prefer longish fics set during the five year mission, but I'm pretty much open to anything. Thanks! :)