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USGS employees inside Itaipu Binational Dam on Parana River bottom

By Upper Midwest Water Science Center
Three people in hard hats and an orange reflective shirt stand on a rocky floor inside a dry dam
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Detailed Description

(L to R) USGS's Brian McCallum, Joel Groten, and Molly Wood inside Itaipu Binational dam and standing on the original Paraná River bottom on the border of Brazil and Paraguay.

Sources/Usage

Public Domain.