Vermont Historical Society:
1930 Windsor Connecticut Valley Triangulation
Vermont Historical Society:
White River Junction Triangulation
Vermont Historical Society:
1930 Governor's Tree And Triangles
Vermont Historical Society:
1930 Governor's Tree And Triangles
Vermont Historical Society:
Triangulation
Vermont Historical Society:
Triangulation
Vermont Historical Society:
Triangulation
Vermont Historical Society:
Triangulation
Vermont Historical Society:
Triangulation
Vermont Historical Society:
Triangulation