Groszy Overprints Site dedicated to the groszy overprints of 1950. It utilizes the exhibit material of Polonus member George Zelwinder to identify and illustrate the different overprints used during the currency devaluation. See George's exhibit in the "Exhibits" section of the Polonus website.
Lubelski Philatelic LLC Offers broad scope of Polish philatelic material including Year Sets, Post 1960 issues, and New Issues.
Solidarity Issues Site is dedicated to the issues of the Polish Solidarity movement.
Sports Philatelists International (SPI) Sports Philatelists International (SPI) serves the needs of both novice and experienced Olympic and sport stamp collectors throughout the world.
Stamp Collecting 101 Site provides and overview of the basics of stamp collecting
Stamp Domain An comprehensive philatelic site providing data on stamps of the world including an excellent section pertaining to the Stamps of Poland
Stamp Encyclopedia of Poland An extremely comprehensive listing of all the areas of Polish philately including regular issues, local issues, P.O.W issues and Labels. Virtually all issues items are described this comprehensive vast wealth of information. Text is in English