Geological:

Central Geological Database (CBDG)

Hydrogeological:

Information about Hydrogeological databases are on PSH web page

Mineral raw materials:

System Management and Protection of Mineral Resources (MIDAS) (only in Polish version)

Mineral Resources of Poland

Environmental geology:

Geochemical mapping in Poland

Geoenvironmental database (only in Polish version)

Polish central register of geosites (only in Polish version)

Geotops Polish-Lithuanian border region

Engineering geology:

Engineering-geological atlases of urban agglomerations

Bibliography:

Library directory of PGI (only in Polish version)

Polish Geological bibliography 1989-2005 (only in Polish version)

Polish Geological bibliography from 2006 (only in Polish version)

Acces to geological and hydrogeological spatial data are here:
Geoportal IKAR
Geoportal e-PSH
Geoportal.gov.pl

More information on other databases mady by Polish Geological Instytiute are in Polish version