I have a 1948 20 Dwadziescia Zlotych
Between a few USD and a few hundred USD, all depends on the quality and series (the red font, letters and numbers) logically a few USD as most likely it was in circulation and belongs to the common series.
and 4 from 1919 - a 5, a 10, a 20 and a 100.
It's like "pięć marek polskich" etc. ? Then again a few USD each. But these are just estimates and like a previous guy said, they are worth as much as someone is willing to pay... Generally it's not any treasure but they are not worthless. Of course I'm talking about collectors as you can't pay with them.