It's been ages since I've seen Laile Bartlett's Bright Galaxy: Ten Years of Unitarian Fellowships (1959) and I've never had one at hand long enough to read it closely. So I found a copy for sale online and it arrived a few days ago. It is still the definitive work on the Fellowship Movement, or at least the early phase.
I wondered what she thought the strengths and weaknesses of the fellowships were, and at least as importantly, what period Unitarian leaders thought they were doing. Why? Because even though it was an experience of rapid growth and geographic expansion, it's hard to find someone in UUA officialdom that'll call it a success or be willing to stake out a culturally-appropriate iteration of what "fellowships" can be. (Terminology seems to be part of the problem, thus the scare quotes.) But what we're doing now isn't working.
I'll pull excerpts as appropriate.
And I'd never seen one with its dust jacket. See! Neuland!