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man operating steam shovel
1908-09-01
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man with horses
1907-09-01
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man standing near conduit and portable form
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men digging near cement plant
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"showing character of dump from tunnel, used in making concrete. This material gives very high grade concrete. (J.B.L. - March 1907)"
1907-03-01
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buildings in valley
1911-02-01
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two men on riverbank
1906-11-01
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men near aqueduct cover - under construction
1907-09-01
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"Hunters Brook Siphon, Catskill Aqueduct, Peekskill Division."
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"rock crusher and concrete mixer at Soda Springs."
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men standing on bridge
1907-09-01
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