I've tried and tried, but I can't figure this one out. It looks somewhat like Optima, but not exactly. It appeared on a mid-1970s book cover (Robert Adams, The New West) and a mid-1980s book cover (Jennifer Bartlett, Rhapsody).

Adding image of "Rhapsody" and link to much larger version on Flickr: http://www.flickr.com/photos/brewbooks/1228669750/sizes/o/

Radiant from Red Rooster is similar but a bit condensed. If you graphically flattened/widened Radiant you might be close. It even has an alternate R that looks like the album typeface.
- Mike Yanega
More Baker Sans stuff... There were three styles: Fineline, Display and Monoline. Notice that the Monoline is practically identical to Helvetica. The other two differ in the amount of stroke contrast. It's an interesting concept, but I've rarely seen any of them in use. Not too common in type specimen catalogs, either. At least the ones I have. I think the designer may have been Ray Baker. Probably not Arthur Baker, but I really don't know. I don't think any of them have been digitized.

Captured from web.archive.org on 30 May 2017. view this capture