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Holland grass, due to its toughness and well-matting roots, is ideal for stopping the drifting sand dunes along the Oregon coast

Holland grass, due to its toughness and well-matting roots, is ideal f...

Public domain photograph - historical image of Ohio, United States, free to use, no copyright restrictions image - Picryl description

Subcontracting aircraft parts. Heat treatment is essential to develop the toughness necessary in the metal for U.S. warcraft. This worker is quenching a metal sheet which has just come from the furnace. Goodyear, Akron, Ohio

Subcontracting aircraft parts. Heat treatment is essential to develop ...

Picryl description: Public domain image of a factory, plant, manufacture, assembly line, industrial facility, early 20th-century industrial architecture, free to use, no copyright restrictions.