Leveling mark on the tunnel, Circum-Baikal Railway


Shmalebroken
 

League of Surveyors
 
Leveling mark on the tunnel, Circum-Baikal Railway
Source
Leveling mark on the tunnel, Circum-Baikal Railway - My, Level, Geodesy, Baikal, Railway
Baikal Geodesy Railway Level
v20240901