I've done this before and used a 4 1/2" angle grinder with a rubber sand paper disk attachment to grind off the glue and stuck bits of wood. Use something aggressive like 24 grit and wear a dust mask. I have a multimaster and love it but they are really expensive tools and the the blades are ridiculously over priced. The blade attachment removes glue from vinyl floors very well and without the dust of grinding it off but if you have to do a large area with lots of stuck wood splinters you will either go through multiple blades or have to learn how to sharpen the blades when they get dull.

I'm using the Fein Multimaster on fixing up an old PT boat. I was pretty skeptical at first and have warmed up considerably. It's great for getting those odd places, flat cuts. It's a bit $$$ and the blades are too but I don't know anything that can do the finicky work that it can do. But for your needs what the other poster said about using a 4" angle grinder. That should work. You'd be amazed at what the 40 grit sandpaper on that can eat thru. metal, glue, tar. With a light touch, you can keep things smooth. It might be better for your $$ and the job at hand.

Nice salvage btw.

Hey Carolyn-
3 questions:
1) how thick is the flooring?
2) is it clean of nails, screws and other metal bits?
3) do you have access to a high-school (via adult education)?

I've taken wood shop classes at local high schools for several years now to gain access to their (generally cabinet shop-grade) tools. If this is an option, bringing a friend and planning on spending several class sessions running floor boards through a planer will be quick, clean, and pretty inexpensive-- the classes in SLC are generally on the order of $100 for 10 weeks.

possibly another option... I'm not sure what a Fein Multimaster is, but my general take on tools is that I try to avoid buying them unless I can use them for job after job.

cheers to you!
Chris