Hank Bieniecki : Discovered: Original Woldenberg POW Camp Protocol for the 1943 Revenue Series
in: POLONUS 579 - June 2020 Bulletin of the Polish Philatelic Society Benicia, CA 2020

# Lager / Konzentrationslager / Kriegsgefangenenlager # Fiskalmarken / Stempelmarken

Jan Niebrzydowski : Displaced Persons Camp Hohenfels, Germany 1945 - 1949
in: POLONUS 579 - June 2020 Bulletin of the Polish Philatelic Society Benicia, CA 2020

# Lager / Konzentrationslager / Kriegsgefangenenlager

Jerzy W. Kupiec-Weglinski : Polish Mail Flown by Zeppelin Airships
in: POLONUS 579 - June 2020 Bulletin of the Polish Philatelic Society Benicia, CA 2020

# Polen # Zeppelin

Andrew Sader : Postwar Overprint General Gouvernement Warschau Fischer Catalog 14I
in: POLONUS 579 - June 2020 Bulletin of the Polish Philatelic Society Benicia, CA 2020

# Polen # Studien zu einzelnen Marken / Markenserien

Jerzy W. Kupiec-Weglinski : The Rarest Polish Airmail Disaster Cover
in: POLONUS 579 - June 2020 Bulletin of the Polish Philatelic Society Benicia, CA 2020

# Flugpost / Luftpost / Aerophilatelie # Katastrophenpost