Well, I finally found a 350 for me after 10 years or so of looking. It is a C version and will be here in a couple of weeks. So, off to eBay I went to pick up some manuals for it.
Now, you know, some time back I went and produced a list of manuals for all the iron we love to chat about around here. For the 350C, I just went to the Yellow Deere site and grabbed some numbers. Today, I see where there are several Operator Manual numbers for sale:
OM T44047
OM T56371
OM T62741
OM T70343
OM T73439
OM T79469
That last one is the one listed over on the Deere site. I bought T73439 as it was the lowest cost one out there. However, the serial number of mine is from mid-run 1978 so that puts it near the beginning of the C line. These numbers are in production order, so now I wonder if I ought to have bought one of the lower number ones....
I think I know how to operate a crawler dozer by now, but want to read thru an OM anyway. Might be a tidbit in there, you know.

But, why so many OMs for the C series? Anyone know what changed between any of these? Perhaps the later OMs just add things and so also cover the earlier machines?
At least the TM and PC numbers were only one each. And, they are more important anyway.
Stan