A few months ago, I bought a 1925 bungalow in Minneapolis. After central A/C was installed, I poked around in the floor vent and noticed there's hardwood flooring underneath the linoleum (and under the plywood subfloor).

The rest of the house has hardwood floors, which we just had refinished. Does anyone have advice on how to pull up the plywood subfloor and the linoleum without damaging the hardwood underneath? I'd like to restore the hardwood floor underneath.