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• Objects 82

• Photograph 82

• photograph 82

• normalized 82

• waterworks 4628
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• construction sites 2062
• real estate 1581
• pipes (conduits) 636
• aqueducts 495
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• general views 89
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• culverts 65
• swamps 60
• Pre-construction site 56
• brooks 49
• tables (documents) 48
• mills (buildings) 47
• hydroelectric power plants 45
• cemeteries 44
• sewage treatment 42
• riverbanks 35
• residential structures 32
• churches (buildings) 31
• roads 30
• 1886-1888 Bellevue Hill Water Tower 29
• Old Stone Church 28
• river beds 26
• identification signs 25
• forestry 25
• graphs 25
• labor camps 23
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• outbuildings 22
• railroad bridges 21
• competition drawings 18
• pumping machinery 16
• roadways 16
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• equipment for engineering and building trades 15
• schoolhouses 15
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• trolley cars 12
• billboards (site elements) 12
• office buildings 12
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• watershed maps 9
• air locks (airtight spaces) 9
• surveying instruments 8
• bridges (built works) 8
• sponge (material) 8
• flowmeters 7
• testing equipment 7
• storage facilities 7
• bicycles 7
• offices (work spaces) 7
• interior views 6
• diagrams 5
• watershed sanitary protection 5
• drainage 5
• schools (buildings) 5
• Worcester County Training School 5
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• Police Strike, Boston, Mass., 1919 5
• compressors 4
• steamrollers 4
• greenhouses 4
• groups of people 4
• stables (animal housing) 4
• quarries (extracting complexes) 3
• boards of directors 3
• Venturi Meters 3
• rivers 3
• keys (texts) 3
• architectural drawings (visual works) 3
• garages 3
• valves (hardware) 3
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• surveyors 2
• track scales 2
• grounds (open spaces) 2
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• Profile Rock 2
• American Telephone and Telegraph Company 2
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• meters (measuring devices) 2
• schematic drawings 2
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• apparatuses 1
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• arches 1
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• construction milestone 1
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• Massachusetts 82
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• Photographs 82

• Dry plate negatives 54
• Lantern slides 28

• Still image 82