Hrací karty v Praze
Muzeum Hlavního Mesta, Prague, 1989
the cataloque contains some illustrations of tax stamps used in Czechoslovakia (without dates).
text in Czech.
Playing-card Tax Stamps from Czechoslovakia
in: The Playing-Card, Vol. 35, No. 2, Oct. - Dec. 2006, pp. 115 - 120
a detailed description of playing-card legislation in Czechoslovakia with a lot of illustrations of tax stamps and tax bands.
text in English.