Dolnośląska Biblioteka Cyfrowa
The Lower Silesian Digital Library contains digitised collections of several regional institutions and libraries including many items of interest to historians. The Digital Library can be browsed by institution, title, creator or keyword as well as searched by publication text or a variety of record metadata (such as author, year, etc.).
To view items you need to install the DjVu plugin (a few items are offered in PDF-format).