Structural steel, 1971; two men standing at the top of scaffolding attaching cabling to a pole [1 of 2]
Structural steel, 1971; men working on a steel structure; others on the ground working
![Structural steel, 1971; men working on a steel structure [3 of 3]](/uploads/r/null/4/7/8/478f0f7fba96fae17c002b3506b27b1e18fb22867b5f9bcc4687fb9196bea63a/a004873_142.jpg)
Structural steel, 1971; men working on a steel structure [3 of 3]
![Structural steel, 1971; men working on a steel structure [2 of 3]](/uploads/r/null/c/3/e/c3e21d00fdd3287467f09697c36f3ac1831a384f1380ccdcc2bd9b8e08bb7067/a004872_142.jpg)
Structural steel, 1971; men working on a steel structure [2 of 3]
![Structural steel, 1971; men working on a steel structure [1 of 3]](/uploads/r/null/a/d/e/adeda68984f6f075f5c9babff9995eb8384b941a9dec4e7821f6b14b386fd5ba/a004871_142.jpg)
Structural steel, 1971; men working on a steel structure [1 of 3]
Structural steel, 1971; man walking along a beam at the top of a steel structure
Structural steel, 1971; man shaping a piece of steel cable
Structural steel, 1971; man cutting wires on a steel grid
Structural steel, 1971; a worker sitting on the top beam of a structure tightening bolts on a beam
Structural steel, 1968; workers using a crane to place a side beam on a structure; people working in background [2 of 2]
Structural steel, 1968; workers using a crane to place a side beam on a structure; people working in background [1 of 2]
Structural steel, 1968; workers using a crane to place a large piece of steel into the ground [2 of 2]
Structural steel, 1968; workers using a crane to place a large piece of steel into the ground [1 of 2]
![Structural steel, 1968; workers constructing a steel structure [4 of 4]](/uploads/r/null/f/9/0/f90bf37b9407468651449a5df6940eee8a6d27b24cd8780b9326c6a1ec1aa9f5/a004834_142.jpg)
Structural steel, 1968; workers constructing a steel structure [4 of 4]
![Structural steel, 1968; workers constructing a steel structure [3 of 4]](/uploads/r/null/5/4/b/54bd6ac8ba3fb225e6d630624390b19bf562af07fe2302b22e4999244ab882e9/a004833_142.jpg)
Structural steel, 1968; workers constructing a steel structure [3 of 4]
![Structural steel, 1968; workers constructing a steel structure [2 of 4]](/uploads/r/null/4/2/d/42d09273438509b866ede83dea7c3b96da3ea0e8330e9d4fbba17e5f488654c1/a004832_142.jpg)
Structural steel, 1968; workers constructing a steel structure [2 of 4]
![Structural steel, 1968; workers constructing a steel structure [1 of 4]](/uploads/r/null/7/8/a/78a525d9cb256d0f86cc639011404b5e5db7f7687bd22b13188485696d3d50c9/a004829_142.jpg)
Structural steel, 1968; workers constructing a steel structure [1 of 4]
Structural steel, 1968; workers assembling a side brace to a steel structure
Structural steel, 1968; worker tightening bolts on the corner of a structure; worker watching from below
Structural steel, 1968; worker tightening a bolt on a steel structure
Structural steel, 1968; worker hanging onto a steel structure
Structural steel, 1968; worker at the top of a structural hooking steel wire onto a crane; two men working
Structural steel, 1968; two workers securing corners of a structure; one worker operating a crane
Structural steel, 1968; students constructing a tall steel structure in a field
Structural steel, 1968; students constructing a steel structure in a muddy field
