Guntvedt, Per Kristian
Stempler benyttet ved stempling av spillekort i Norge
in: Kartofilen 2/13, Vol. 23, pp. 20 -23
illustrations, descriptions and dates of playing-card tax stamps used in Norway.
text in Norwegian.
Norwegian Playing Card Tax Stamps
in: Luren, Scandinavian Philatelic Library of Southern California,
Vol. 29, No. 2, pp. 13 - 14
(the Norwegian original appeared in "Kortleiken".)
a description of playing-card taxation in Norway and illustration of several tax stamps.
text in English.