* Library of Congress. ''A Country Study: Poland'' (1993), highly detailed factual report by U.S. government (it is in the public domain, with no copyright) [http://lcweb2.loc.gov/frd/cs/pltoc.html online edition] | * Library of Congress. ''A Country Study: Poland'' (1993), highly detailed factual report by U.S. government (it is in the public domain, with no copyright) [http://lcweb2.loc.gov/frd/cs/pltoc.html online edition] |