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Construction workers
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635
Construction (Assembling)
589
Construction equipment
144
Excavating machinery
116
Sidewalks
89
Automobiles
68
College buildings
51
Lecture halls
50
Roads -- Design and construction
44
Bricks
39
College campuses
38
Historic buildings
38
Stairs
31
Brickwork
26
Cherry pickers (Machines)
21
Landscaping
21
Loaders (Machines)
20
Streets
20
Median strips
19
Cranes, derricks, etc.
17
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