While the General Sources page will get you links to resources that span Europe, the West and East European Studies pages by country are lists of specific links from official entities in country.
For each country you will find:
The top level country domain. This can be helpful in searching all of the webpages in a specific country's domain. Use "site:" before the domain in Google (for example site:.ru for Russian websites and site:.de for German).
Open data, official statistical agencies, and bank statistics from the country.
Open legislative, executive, and judicial documents and some historical documents.
Links to archives, archival portals, digital libraries, and national libraries in each country. Searching national library catalogs can be a good way to find books that are not widely held in the United States.
Links will periodically go out of date, as they are changed. Please contact the guide administrator to let them know if you discover a broken link or otherwise run into an inaccuracy.