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Wallkill pressure tunnel. View showing full-section steel forms in place. The concrete is placed in one operation. Contract 47. June 8, 1911.

Wallkill pressure tunnel. View showing full-section steel forms in pla...

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

Wallkill pressure tunnel. View showing "trailing" method of placing concrete in  side -walls and arch in one operation. Note high roof excavation.  Contract 47. April 12, 1911.

Wallkill pressure tunnel. View showing "trailing" method of placing co...

Picryl description: Public domain image of a mining, coal mine, underground, free to use, no copyright restrictions.

Loading bins of potato planter which fertilizes and plants potatoes in one operation. Kern County, California

Loading bins of potato planter which fertilizes and plants potatoes in...

Public domain photograph of Dorothea Lange, free to use, no copyright restrictions image - Picryl description Dorothea Lange was an American documentary photographer and photojournalist, widely recognized for ... More

Kern County, California. Large-scale mechanized farming. The potato planter, operated by a crew of three men, makes the rows, fertilizes and plants potatoes in one operation

Kern County, California. Large-scale mechanized farming. The potato pl...

Public domain photograph of Dorothea Lange, free to use, no copyright restrictions image - Picryl description Dorothea Lange was an American documentary photographer and photojournalist, widely recognized for ... More

Loading bins of potato planter which fertilizes and plants potatoes in one operation. Kern County, California