I bought a bunch of capacitors at a garage sale can I use these in old radios?

[Donny]

The bigger caps that have marking un them that I can understand are too low of voltage for tube radio use but the small caps are marked weird here are a few examples 10k kc k, 65 10% RMC N15CO, 200-k N750 100V, 69 k N750, 200k 100V N750. Can I use these? If so how do I know uf, working voltage? I have a few hundred caps and 200 or so resistors as well. I paid $2 so not a big loss if I can't use them.