Q: One visitor asked, "How do we get the old lanolium off the floor to get to the wood?"

A: I assume this is glued to your hardwood floor. If this is so, and this hardwood is the old style 3/8 thick product, then if I was you, I would set my skil saw to depth and remove everything down to the sub floor and start over. Even if you are able to get most of the layer of linoleum off the floor, the adhesive and some of the backing will remain. These 3/8 floors are only good for 2 sandings, and 3 if you are very lucky. We must assume they have been sanded at least once already. Aside from the question of why someone would glue linoleum to a hardwood floor if it is in salvageable condition, the question also comes up: What will be left of them after I have ground off all that mess that is stuck to them? And the answer is probably: Not Much. I would take everything up to the existing sub floor, probably screw down at least 3/8 spruce plywood, and then the floor of your choice.