U.S. Embassy in Warsaw, Poland:
http://warsaw.usembassy.gov
U.S. Department of Commerce:
http://www.doc.gov
U.S. Department of State:
http://www.state.gov
Office of Agricultural Affairs, U.S. Embassy Warsaw
http://warsaw.usembassy.gov/poland/agric.html
American Chamber of Commerce in Warsaw, Poland
http://www.amcham.com.pl
European Bank for Reconstruction and Development
U.S. Commercial Service Liaison Office
http://www.buyusa.gov/ebrd/
U.S. Export-Import Bank
http://www.exim.gov
The Polish Government sites:
Polish Information and Foreign Investment Agency
The Polish Securities and Exchange Commision
The National Broadcasting Council
National Fund of Environmental Protection and Water Management
Polish Embassy in Washington, Trade & Investment Section
The Ministries:
Ministry of Economy, Ministry of Regional Development
Ministry of Culture and National Heritage
Ministry of Agriculture and Rural Development
Ministry of Internal Affairs and Administration
Ministry of Environmental Protection
Others:
BizPolnad Poland's English-language Portal for Foreign Investors
Expo XXI Warsaw International Expocenter
Międzynarodowe Targi Polska, organizer of large trade fairs in Warsaw.