Yolo Buggy used to transport and shade base measuring instruments.Yolo Base Line, one of the most accurate measured in the Nineteenth Century.Base Line party of George Davidson
3/18/2019 2:18:32 PM
Date: 1881
Credit: NOAA National Geodetic Survey
Location: Sacramento Valley, California
Subject: Geodesy
Subject: Triangulation
Subject: Baseline
Subject: Bar