BALaT Licensed under CC BY 4.0 KIK-IRPA, Brussels (Belgium), cliché KN006178] https://creativecommons.org/licenses/by/4.0/ https://balat.kikirpa.be/copyright/copyright_en-GB.php Digitally Enhanced
BALaT Licensed under CC BY 4.0 KIK-IRPA, Brussels (Belgium), cliché X010894] https://creativecommons.org/licenses/by/4.0/ https://balat.kikirpa.be/copyright/copyright_en-GB.php Digitally Enhanced
National Cultural Heritage Agency of Netherlands / Document No. 356, Photographer A. J. van der Wal, Digitally Enhanced, http://creativecommons.org/licenses/by-sa/3.0/
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National Cultural Heritage Agency of Netherlands / nterbellum_0270, Photographer Sjaan van der Jagt, Digitally Enhanced, http://creativecommons.org/licenses/by-sa/3.0/