Various, irregular maps produced by the Wojskowy Instytut Geograficzny (until 1921: Instytut Wojskowo-Geograficzny). The maps are sorted by their publication date. Because of the nature (individual, irregular sheets), they have been made available as map lists:

1. various topographic maps

2. small & mid-scale maps

There is also a (post-WW2) study on the Italian campaign and participation of Polish Armed Forced in Exile (including, but not limited to the Battle of Monte Cassino), and maps have been made available, courtesy of the Central Military Library in Warsaw.

Sheet with various overprints related to Italian campaign, can be accessed via regular GSGS 4228 (Italy, 1:25 000), and GSGS 4229 (Italy 1:50,000). Those collections will receive a large number of sheets from various other, online collections, but no sooner than in 2021.