Removing wind tarps at Station Umbarger.Wind tarps protect inner instrument tower from wind.Triangulation party of Earl O. Heaton
3/18/2019 3:06:42 PM
Date: 1921
Credit: C&GS; Season's Report Heaton 1921
Location: Randall County, Texas
Subject: Geodesy
Subject: Triangulation
Subject: Towers
Subject: Wooden