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- Authors, American--20th century9
- Cranes and derricks1
- Industries --United States --Pictorial works2
- Machine-tools --Pictorial works2
- Machinery in art6
- Machinery--Aesthetic aspects6
- Machinery--Pictorial works5
- Marine termin1
- Marine terminals --United States--Pictorial w1
- Measuring instruments1
- Metal-workers--United States --Pictorial works1
- Metalworking industries1
- Pyrometers --Pictorial works1
- Transit, Surveyors' --Pictorial works1
