写真出典: Wikimedia Commons
hero.jpg | File:Aerial view of Nagashima between the Kiso and the Nagara Rivers Jul 30, 2016.jpg | CC BY-SA 2.0
river.jpg | File:Nagara River and Mount Ibuki from Gifu Castle.jpg | CC BY-SA 4.0
levee.jpg | File:Levee recovery at Ushizu River in Noso in 2021.jpg | CC BY-SA 4.0
embank.jpg | File:Soil Nailing of the Approach Embankment UT (8495169979).jpg | Public domain
excavator.jpg | File:Excavator performs earth digging.jpg | Public domain
survey.jpg | File:Highway Calumpit railway station construction sites 10.jpg | CC BY-SA 4.0
soiltest.jpg | File:Testing compaction of soil sediment placed in the thermal treatment. (26203673263).jpg | Public domain
pond.jpg | File:Mt. St. Helens sediment structure completed - USACE-p15141coll5-16977.jpeg | Public domain
dump.jpg | File:US Navy 090320-N-8547M-020 A Seabee assigned to Naval Mobile Construction Battalion (NMCB) 5 directs a medium tactical vehicle replacement dump truck where to add dirt during a landing strip expansion project.jpg | Public domain
roller.jpg | File:Caterpillar CB54B roller on dirt lot in Campbell.jpg | CC BY-SA 4.0
office.jpg | File:WWII Shropshire, RAF Condover - Control tower, Watch Office ^ Floodlight Tractor ^ Trailer shed - geograph.org.uk - 6204988.jpg | CC BY-SA 2.0
news.jpg | File:Writing with a fountain pen (Unsplash).jpg | CC0
office.jpg | File:Otogawa-Asahicho-1.jpg | CC0
workers.jpg | File:Building construction crane Moira Close Broadwater Farm Haringey 2025 69.jpg | CC BY-SA 4.0