Lowering tubebundle into body ; Open condensers on test ; Heat-exchand...
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.
"Test your strength," county fair, central Ohio
Picryl description: Public domain photograph of worker, marketplace, vendor, 1930s, Great Depression, economic conditions, free to use, no copyright restrictions.
Moisture test for soil, Dept. of Agriculture Experimental Farm. Prince...
Public domain photograph of Great Depression era, artistic, art photography, free to use, no copyright restrictions image - Picryl description
Moisture test for soil, Dept. of Agriculture Experimental Farm. Prince...
Public domain photograph of Great Depression era, artistic, art photography, free to use, no copyright restrictions image - Picryl description
Moisture test for soil, Dept. of Agriculture Experimental Farm. Prince...
Public domain photograph of Great Depression era, artistic, art photography, free to use, no copyright restrictions image - Picryl description
"Test your strength," county fair, central Ohio
Public domain photograph of Great Depression era, artistic, art photography, free to use, no copyright restrictions image - Picryl description
Moisture test for soil, Dept. of Agriculture Experimental Farm. Prince...
Public domain reproduction of illuminated book page, free to use, no copyright restrictions image - Picryl description
Moisture test for soil, Dept. of Agriculture Experimental Farm. Prince...
Picryl description: Public domain photograph of a farmer, 1930s great depression, dust bowl era, 20th century, free to use, no copyright restrictions.
Moisture test for soil, Dept. of Agriculture Experimental Farm. Prince...
Public domain photograph of Great Depression era, artistic, art photography, free to use, no copyright restrictions image - Picryl description
On test - exchangers, furnace headers, bubblecap assemblies ; 200-squa...
Public domain scan of artwork related to technological or industrial history, free to use, no copyright restrictions image - Picryl description
"Test your strength," county fair, central Ohio
Picryl description: Public domain photograph of worker, marketplace, vendor, 1930s, Great Depression, economic conditions, free to use, no copyright restrictions.
Moisture test for soil, Dept. of Agriculture Experimental Farm. Prince...
Picryl description: Public domain photograph of workers, war production, aircraft, airfield, the 1930s -1940s, free to use, no copyright restrictions.
Moisture test for soil, Dept. of Agriculture Experimental Farm. Prince...
Picryl description: Public domain photograph of a farmer, 1930s great depression, dust bowl era, 20th century, free to use, no copyright restrictions.
"Test your strength," county fair, central Ohio
Public domain photograph of Great Depression era, artistic, art photography, free to use, no copyright restrictions image - Picryl description
Moisture test for soil, Dept. of Agriculture Experimental Farm. Prince...
Picryl description: Public domain photograph of workers, war production, aircraft, airfield, the 1930s -1940s, free to use, no copyright restrictions.
Moisture test for soil, Dept. of Agriculture Experimental Farm. Prince...
Public domain reproduction of illuminated book page, free to use, no copyright restrictions image - Picryl description