Jerzy W. Kupiec-Weglinski
: Polish Mail Flown by Zeppelin Airships in: POLONUS 580 - September 2020 Bulletin of the Polish Philatelic Society Benicia, CA 2020
James Mazepa
: The Poland Flag Stamp: an Unusual Use by a Polish Airman Stationed in Canada in: POLONUS 580 - September 2020 Bulletin of the Polish Philatelic Society Benicia, CA 2020
Jerzy Walocha
: The Police during the Plebiscite in Upper Silesia - a Little - Known Fragment of History in: POLONUS 580 - September 2020 Bulletin of the Polish Philatelic Society Benicia, CA 2020
