Julian Auleytner
: Local Lublin Issues in Postal Use: 1918 - 1919 in: POLONUS 577 - January 2020 Bulletin of the Polish Philatelic Society Benicia, CA 2020
Hans Vogels
Jerzy W. Kupiec-Weglinski
: Zeppelin Mail from Polish Post Office in Port Gdansk (1932 - 1936) in: POLONUS 577 - January 2020 Bulletin of the Polish Philatelic Society Benicia, CA 2020
