OK. I've done the first of the manuals I have. Thanks for all the helpful hints.
I took apart the Rainbow User's Manual's metal spiral spine. I scanned it with scansnap and ran it through the indexing function. I think I tweaked the settings in a reasonable way. The results look good to my eye, but I'm not 100% sure, so I thought I'd post it here for feedback: https://people.freebsd.org/~imp/EK-P100E-OM-001_Rainbow_100_Owner's_Manual-Nov-1982.pdf I have the manual still apart and can do additional scanning runs easily enough. The paper is in great shape. Second, how do I submit this to bitkeepers? I've looked around and don't see how. maybe I'm just being blind... Warner