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- Authors, American--20th century4
- Machinery in art4
- Machinery--Aesthetic aspects4
- Machinery--Pictorial works4
- Machine-tools --Pictorial works2
- Industries --United States --Pictorial works1
- Marine terminals --United States--Pictorial w1
- Measuring instruments1
- Metal-workers--United States --Pictorial works1
- Pyrometers --Pictorial works1
- Transit, Surveyors' --Pictorial works1