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• Objects 85

• Photograph 85

• photograph 85

• normalized 85

• waterworks 4628
• reservoirs (water distribution structures) 2777
• construction sites 2062
• real estate 1581
• pipes (conduits) 636
• aqueducts 495
• watershed sanitary improvement 260
• pumping stations 188
• water towers 116
• water tunnels 105
• general views 89
• arch bridges 89
• streetscapes 88
• electrolysis 85
• engineering maps 82
• construction completed 70
• filter beds 65
• 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
• falsework 22
• outbuildings 22
• railroad bridges 21
• competition drawings 18
• pumping machinery 16
• roadways 16
• power lines 16
• government employees 16
• equipment for engineering and building trades 15
• schoolhouses 15
• construction workers 13
• trolley cars 12
• billboards (site elements) 12
• office buildings 12
• icehouses 11
• engineers 11
• business (commercial function) 10
• trucks 10
• boiler rooms 10
• 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
• boring machinery 5
• 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
• pipe yards 3
• surveyors 2
• track scales 2
• grounds (open spaces) 2
• settling basins 2
• civil engineers 2
• Hersey Meters 2
• Crown Meters 2
• contractors 2
• Profile Rock 2
• American Telephone and Telegraph Company 2
• fire hydrants 2
• meters (measuring devices) 2
• schematic drawings 2
• sewage treatment plants 2
• police officers 2
• locomotives 2
• railroad stations 2
• apparatuses 1
• drinking fountains 1
• printing presses 1
• railroad cars 1
• bicyclists 1
• lithographs 1
• signage 1
• Crataegus (genus) 1
• arches 1
• biological sciences equipment 1
• microorganisms 1
• photomicrographs 1
• forestry maps 1
• land surveys 1
• Addition construction completed 1
• organizational charts 1
• spillways 1
• nurseries (horticulture) 1
• water-supply engineers 1
• open automobiles 1
• scows 1
• grinding wheels 1
• tugboats 1
• fire stations 1
• libraries (buildings) 1
• construction milestone 1
• African Americans 1

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• Massachusetts 85
• North and Central America 85
• United States 85
• Suffolk (county) 61
• Chelsea River 39
• Boston 22
• Essex (county) 19
• Lynn 19
• East Boston 5
• Hyde Park 3
• Berlin 2
• Dorchester 2
• Worcester (county) 2
• Bridgewater 1
• Brighton 1
• Plymouth (county) 1

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• Photographs 85

• Dry plate negatives 75
• Photographic prints 10

• Still image 85