publication

Countries:

United Kingdom:

Drachinifel - Subterranea - The Operations Room - Casemate - Fortress: The Castles and Fortifications Quarterly - The Journal of the Arms & Armour Society - Journal of the Ordnance Society - The Tank Museum - ALW Research Team - The Castle Studies Group Journal - FORT - Military History Matters - Castle Studies Group Bulletin - The Redan - Fortress - Descent

Poland:

Drachinifel - Subterranea - The Tank Museum - vbbsmyt

Historical Countries:

United Kingdom of Great Britain and Ireland:

Drachinifel - Subterranea - Historigraph - The Tank Museum - vbbsmyt