Monongahela River. Bridges across Monongahela, Allegheny, and Toughioghony rivers, Allegheny County, Pa., report to accompany H.R. 8241 [to authorize construction of certain bridges across Monongahela, Allegheny, and Youghiogheny rivers in county of Allegheny, Pa., by Allegheny County Authority and county of Allegheny, Pa., or either of them]; submitted by Mr. Sheppard.