That black stuff on the floors is tar paper. It had bonded to the floor over the last 80 years and was impossible to scrape off. I rented a floor sander, the drum kind, with lots of heavy grit paper and chewed through it. You've got to be really careful wit the drum sanders because they can gouge the wood really easily,never stop
I followed up afterwards with a vibrating pad floor sander to smooth everything out. There are still some minor grooves and waves in the floor from the drum sander but I don't think I can sand them out anymore....we'll see.
Lots of dust! Get yourself a Hepa respirator.
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