The first icelandic cancellations
Roman types and grotesk (lapidar) types as well as 3 ring number cancellation "236 and "237".
Extensive documentation with images (in German).

The Bøgh-Fakes
Incorrect use of danish cancellations on icelandic stationerys (in German).

The Issue "King Christian X. 1920 - 1937"
Statistical and Special (in German)

Forgery of number cancel 35
Manipulation from number cancel 33

Icelandic Booklets
from M. Wiegner († 2020)

Icelandic Philatelic Magazine
by Brian Flack