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Ashokan Reservoir. View of Esopus creek at Olive Bridge dam site, showing coffer -dams and two lines of 8-foot steel pipes for carrying flow of creek. August 8, 1907.

Ashokan Reservoir. View of Esopus creek at Olive Bridge dam site, sho...

Picryl description: Public domain image of a quarry, excavation or mining site, free to use, no copyright restrictions.

Outline map of New York Harbor & vicinity : showing main tidal flow, sewer outlets, shellfish beds & analysis points.

Outline map of New York Harbor & vicinity : showing main tidal flow, s...

Public domain scan of a vintage map, plan, atlas, free to use, no copyright restrictions - Picryl description.

Ashokan Reservoir. View of up-stream face of Olive Bridge dam showing forms for concreting stream-flow opening in place. Note 6-foot opening at bottom for carrying flow of Esopus creek. Contract 3. August 25, 1913.

Ashokan Reservoir. View of up-stream face of Olive Bridge dam showing ...

Public domain photograph of industrial architecture, factory building, free to use, no copyright restrictions image - Picryl description

Aerators. View looking towards Ashokan Screen chamber showing aerator with all nozzles in operation with a flow of 376 million gallons daily. Contract 10. June 18, 1917.

Aerators. View looking towards Ashokan Screen chamber showing aerator ...

Public domain photograph of industrial architecture, factory building, free to use, no copyright restrictions image - Picryl description

Ashokan Reservoir. Forms for concrete plug, 26 feet thick, in stream-control conduit in Olive Bridge dam. The 6-foot opening at bottom carries the flow of Esopus creek. Contract 3. August 25, 1913.

Ashokan Reservoir. Forms for concrete plug, 26 feet thick, in stream-c...

Public domain photograph of industrial architecture, factory building, free to use, no copyright restrictions image - Picryl description

Ashokan Reservoir. View showing construction of conduit built under the Middle dike to control the flow of the Beaver Kill. Contract 3. August 14. 1908.

Ashokan Reservoir. View showing construction of conduit built under t...

Picryl description: Public domain image of a construction site, industrial or commercial building, free to use, no copyright restrictions.

Lift-tractors and their trailers maintain fast flow of materials ; 20-ton yard crane ; 5-ton yard crane.

Lift-tractors and their trailers maintain fast flow of materials ; 20-...

Public domain photograph of factory building, free to use, no copyright restrictions image - Picryl description

Ice Flow in the Hudson at West Point. [Winter.]

Ice Flow in the Hudson at West Point. [Winter.]

New York State stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker w... More

Where still Waters Flow, Nantucket Island, Mass.

Where still Waters Flow, Nantucket Island, Mass.

Public domain photo of vintage Massachusetts postcard, free to use, no copyright restrictions image - Picryl description

Ashokan Reservoir. View at site of Olive Bridge dam, showing coffer-dam and piers under construction for supporting the 8-foot pipes to carry the flow of water in Esopus creek. May 18, 1907.

Ashokan Reservoir. View at site of Olive Bridge dam, showing coffer-d...

Public domain photograph of 20th-century painting, free to use, no copyright restrictions image - Picryl description

Ashokan Reservoir. Up-stream face of masonry portion of Olive Bridge dam. Note temporary opening for flow of Esopus creek. Contract 3. November 19, 1909.

Ashokan Reservoir. Up-stream face of masonry portion of Olive Bridge ...

Picryl description: Public domain image of an arch bridge, stone structure, architecture, free to use, no copyright restrictions.

Ashokan Reservoir. Excavation completed and concrete floor in place for masonry conduit to divert the flow of the Beaver Kill. Contract 3. August 4, 1908

Ashokan Reservoir. Excavation completed and concrete floor in place fo...

Picryl description: Public domain vintage artistic photograph, free to use, no copyright restrictions image.

Hill View reservoir. Downtake chamber showing sluice-gates in place for controlling flow of water to Downtake shaft in center. ... Contract 30. August 8, 1913.

Hill View reservoir. Downtake chamber showing sluice-gates in place f...

Picryl description: Public domain image of a damaged, burned, or destroyed building, natural disaster, war destruction, ruins, 19th-century architecture, free to use, no copyright restrictions.

Ice Flow in the Hudson at West Point. [Winter.]

Ice Flow in the Hudson at West Point. [Winter.]

New York State stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker w... More

Ice Flow in the Hudson at West Point. [Winter.]

Ice Flow in the Hudson at West Point. [Winter.]

New York State stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker w... More

Ice Flow in the Hudson at West Point. [Winter.]

Ice Flow in the Hudson at West Point. [Winter.]

New York State stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker w... More