|Description||English: Portrait of Frederick J. Osterling published in 1913|
|Source||The Book of Prominent Pennsylvanians (https://archive.org/details/bookofprominentp00pitt/page/206/)|
|Description||English: Benno Janssen from a book published in 1923|
|Source||Western Pennsylvanians (https://archive.org/details/westernpennsylva00char/page/196)|
|Description||English: Caricature of Henry Hornbostel by Pittsburgh cartoonist W. S. Washburn|
|Source||Sketches, Serious and Otherwise: Men of Pittsburgh and Vicinity (https://books.google.com/books?id=uScwAAAAYAAJ&pg=PP73#v=onepage&q&f=false)|
|Author||W. S. Washburn|
From Sketches, Serious and Otherwise: Men of Pittsburgh and Vicinity, by W. S. Washburn.