11) West Mifflin. The Columbia Encyclopedia, Sixth Edition. 2001
...borough (1990 pop. 23,644), Allegheny co., SW Pa., a suburb SE of Pittsburgh, on the Monongahela River. There are steelworks and a household appliances plant in West...
12) Ohio, river, United States. The Columbia Encyclopedia, Sixth Edition. 2001
...United States, river, 981 mi (1,579 km) long, formed by the confluence of the Allegheny and Monongahela rivers in SW Pa., at Pittsburgh; it flows northwest, then...
13) Fairmont. The Columbia Encyclopedia, Sixth Edition. 2001
...20,210), seat of Marion co., N central W.Va., where the West Fork and Tygart rivers form the Monongahela; settled 1793 around Prickett's Fort (1774), inc. as Fairmont...
14) McKeesport. The Columbia Encyclopedia, Sixth Edition. 2001
..., city (1990 pop. 26,016), Allegheny co., SW Pa., in hilly terrain at the confluence of the Monongahela and Youghiogheny rivers; settled 1755, inc. as a city 1890....
15) Clarksburg. The Columbia Encyclopedia, Sixth Edition. 2001
...of Harrison co., N central W.Va., at the confluence of Elk Creek and the West Fork of the Monongahela River; inc. 1795. It is an industrial and shipping center for...
16) Pittsburgh. The Columbia Encyclopedia, Sixth Edition. 2001
...(1990 pop. 369,879), seat of Allegheny co., SW Pa., at the confluence of the Allegheny and the Monongahela rivers, which there form the Ohio River; inc. 1816. A major...
17) Tygart. The Columbia Encyclopedia, Sixth Edition. 2001
...km) long, rising in E West Virginia and flowing north to join the West Fork and form the Monongahela at Fairmont. Tygart River Dam (completed 1938), near Grafton,...
18) Allegheny. The Columbia Encyclopedia, Sixth Edition. 2001
...(523 km) long, rising in N central Pa., and flowing NW into N.Y., then SW through Pa. to the Monongahela River, with which it forms the Ohio River at Pittsburgh;...
19) Baldwin, cities, United States. The Columbia Encyclopedia, Sixth Edition.
2001
...2 Borough (1990 pop. 21,923), Allegheny co., SW Pa., a suburb just S of Pittsburgh, on the Monongahela River, in a bituminous coal region; inc. 1952....
20) Homestead. The Columbia Encyclopedia, Sixth Edition. 2001
...center of Homestead. 2 Borough (1990 pop. 4,179), Allegheny co., SW Pa., on the Monongahela River just S of Pittsburgh; inc. 1880. Once a foremost U.S. steel producer,...
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