Sparring - dialogue and help - Arnold Sorensen - USA
Victor Engstrom, Danish West Indies Mail 1754-1917
KPK´s Bibliotek - Nordisk Filatelistisk Tidsskrift
Robert G Stone
- "The mails by German Packets to and from St.Thomas, DWI"
The bisected 4 cents stamp by Torben Hilberg.
Inga and Hans Mortensen - photo of bisceted
Frank Banke - photo of bisceted
Jan Læby - photo of bisected