Darn! It looks like that George Wolstoncroft in Pittsburgh is a different man.
Here's the listing in J.F. Diffenbacher's directory of Pittsburgh and Allegheny cities, 1893/1894:
Wolstoncroft J H, lab, Junius, n Independence
" John, lab, Junius, n Independence
" Mary J, wid Geo, Junius, n Independence
" Nellie, teacher, Junius, n Independence
This is from Historic Pittsburgh City Directories at the website Historic Pittsburgh. There are dozens of directories there.http://digital.library.pitt.edu/p/pitttextdir/