I removed the wall to wall carpet from the 70 year old house I recently
bought.
The floors in the bedrooms appears to be pine coated with shellac or
possibly
polyurethane. I don't want to refinish the floors because of the beautiful
patina.
In only isolated spots and by the door the coating show heavy wear.

How can I find out which coating is on the floors? How can I protect and
preserve
the floors? What should I use to clean and preserve them?

Thanks,

Mike