pouring concrete for walls of large water reservoir, Mount Wilson. Three unidentified construction workers stand on a wooden platform, emptying a bucket of concrete into a wheelbarrow. They are near the construction site for the large water reservoir. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
Concrete Concrete construction Construction workers--United States Wheelbarrows Buckets Hoisting machinery Platforms Hats Trees Photographic prints. (gmgpc)
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