Opinions of D. Kopřiva and P. Sobotka on the philatelic market in these times of crisis. E15, May 2020 (quotes were taken over by other internet medias)
Opinions of D. Kopřiva and P. Sobotka on the philatelic market in a period of crisis. E15, May 2020 (citations were also taken over by other internet media)
Source: E15