Julian Abele and his Legacy….   Here’s a neat link to the Curbed Philadelphia article on Julian Abele, along with a map and description of major buildings designed by Mr. Abele:   http://philly.curbed.com/maps/julian-abele-architecture-history-philadelphia

If you have not encountered Hidden City (hiddencityphila.org), this is a good place to begin (post from 4/2016): Reassessing Horace Trumbauer