active
arch
arizona
blue
bridge
built structure
canyon
cement
color
colorado
concept
concrete
construction
dam
electricity
energy
engineering
generator
hoover
hoover dam
hydro
hydroelectric
image
industry
majestic
mountain
nature
nevada
outdoors
people
photo tourism
power
reservoir
river
sky
station
sunset
technology
usa
water
定額
The construction of the longest concrete arch bridge in the USA. Grand engineering solution. The lower course of the Colorado River. The Black Canyon. The concept of active and photo tourismの素材 [FY310149056265]
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