Structural steel, 1968; students constructing a steel structure in a muddy field
Structural steel, 1968; students constructing a tall steel structure in a field
Structural steel, 1968; students constructing a steel structure in a field
![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; worker tightening a bolt on a steel structure
Structural steel, 1968; workers assembling a side brace to a steel structure
![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 [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 [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; worker at the top of a structural hooking steel wire onto a crane; two men working
Structural steel, 1968; worker hanging onto a steel structure
Structural steel, 1968; workers using a crane to place a large piece of steel into the ground [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; worker tightening bolts on the corner of a structure; worker watching from below
Structural steel, 1968; two workers securing corners of a structure; one worker operating a crane
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 side beam on a structure; people working in background [2 of 2]
Structural steel, 1971; workers assembling a steel structure
![Structural steel, 1971; worker shaping wiring on a steel structure [1 of 2]](/uploads/r/null/8/a/b/8ab6651e0cfea2558fae086ec28f4b3a211f32a4081d0e8c7d9f2308a57269a3/a004844_142.jpg)
Structural steel, 1971; worker shaping wiring on a steel structure [1 of 2]
![Structural steel, 1971; worker shaping wiring on a steel structure [2 of 2]](/uploads/r/null/c/c/1/cc19476ad00cb67ed3083ae1289fc01540d63a1baed31035b57c6d25e9fe3ac7/a004845_142.jpg)
Structural steel, 1971; worker shaping wiring on a steel structure [2 of 2]
Structural steel, 1971; worker welding part of a steel structure
![Structural steel, 1971; worker welding [1 of 2]](/uploads/r/null/b/2/1/b2198e46ec7719c5dfdc25704926bcaa6b1e7369f33dea9f998c387d738cb0ad/a004847_142.jpg)
Structural steel, 1971; worker welding [1 of 2]
![Structural steel, 1971; worker welding [2 of 2]](/uploads/r/null/b/0/e/b0e50425ea4e0be66431c12c1a94200531c31e8dcd52d617fb7fda26129ea0da/a004848_142.jpg)
Structural steel, 1971; worker welding [2 of 2]
Structural steel, 1971; man shaping a piece of steel cable
Structural steel, 1971; workers creating a steel grid
