LXXXIXNo. 7. Movable Dam (Bear Trap Type) Allegheny River. Navigable Pass up Movable Dams Ohio and Allegheny Rivers. Dam 12 Monongahela River Showing Method of Bonding Monoliths with Each Other and with Foundation. Navigable Pass Down Mcvable Dams Lock and Dam No. 12 Monongahela River Built in Monoliths 20 to 30 Feet Long., scientific american, 1903-08-15
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