Sentence:  Other pilot programs were conducted by A + S , Babylon , New York ; J. L. Hudson , Detroit ; Joseph Horne , <WSD>Pittsburgh</WSD> . 
Meaning of the word marked with <WSD> tags:  a city in southwestern Pennsylvania where the confluence of the Allegheny River and Monongahela River forms the Ohio River; long an important urban industrial area; site of Carnegie Mellon University and the University of Pittsburgh