1/4 Inch thick wood floors?

Q: I have a number of damaged areas in my 80 yr. old floor. I pulled up one board section and it is 1/4 inch thick. Can I not get this material any more?

A: The standard thickness for decades with long strip is 3/8 top to bottom. I’ve never seen anything 1/4. If this floor was originally 3/8, then you are down to the tongue and groove, with nothing left to sand.