Glue on back of salvaged wood

Q: I have removed some oak flooring from a renovation job in a house and plan on installing it in my house. I have removed all the nails from the back but there is some glue on the the back which is sometimes hard and sometimes brittle. What is the best method for removing glue?

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Installing salvaged old hardwood strip flooring

Q: I took out some old hardwood strip flooring from a renovation job and pulled out the nails from the back and plan on cutting out the damaged wood and re-installing the good wood in my home. I have put down a tongue and grove plywood subfloor and am wondering if finishing nails or using a glue would be the best way to install the old hardwood.

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