Busmærker og sporvognspoletter i Danmark 1863-1972 Jorgan Somod , Siegs Forlag ,Roslev 1972 , 41pages ISBN 9788785121172
It is a catalogue of Danish bus and tram tokens in alphabetical order by place and then by municipality or company.
It describes the tokens by material , size , punched holes and the major varieties are listed and for most tokens there is a photo . There is 411 tokens and varients listed.
The book is in Danish with a short English glossary and a small section of notes in the back .
It was fairly hard to track down , i got my copy from an antiquarian book shop in Norway.
There are 2 supplements
Busmærker og sporvognspoletter i Danmark 1863-1972 : tillæggskatalog nr 1, 1863-1975 9pages 1975
Busmærker og sporvognspoletter Nr 2 : Danmark 1863-1972 : Danmark 1863-1978 ISBN:9788785103185 21pages 1978
These i haven't managed to get , but i have found them in the central library here in Stockholm , so a little trip to the library is in order.