You've got a couple of good responses already.
My inputs:
First, while I am not 100% on top of things, I think it's fair to say that Polish numismatic references have exploded in the last two decades with catalogs focusing on specific periods and types, and die varants. For trojaks you go to Iger (available online at
https://iger.wcn.pl/) for orts you go to Shatalin. And so on.
Sticking with online references for the moment, the Numista catalog for Poland is very complete. The referee for the medieval to early modern Poland catalog (also a CCF member) followed the Kopicki catalog, and listed every type, even if some are so rare that no photos are available. It is one of the most complete parts of the Numista catalog, even if there are occasional complaints about the many minor variants listed with no explanatory photos.
But, since you specified print catalogs, as mentioned by spence, Kopicki is probably the best and broadest, in Polish and a bit tough to find, published 1990s I think.
I have Gumowski (
Handbuch Der Polnischen Numismatik, 1960) in German, which I got as a spiral bound reprint from Karl Stephens, very inexpensively. I have not checked if he still carries it. It does not list as many variants as Kopicki, just main denomination/date/mint types.
Gumowski is not referenced very much these days in auctions, except for some medieval types.
Sap has made a very good point on coins struck in Vilnius before 1572 (Polish-Lithuanian Commonwealth). Numista places these under Lithuania. Polish numismatic catalogs treat them more like a mint than a different country.
Subtleties of European history.