Source: Rockford Register Star, July 2019, Kristen Zambo.
Jane Addams
“Welcome, Sen. Jones, you found Rockford” by Pat Cunningham, 2006
Source: Rockford Register Star June 21, 2006
Illinois Historical Markers – Rockford
Source: Illinois Historical Markers; a Guide R 917.73 G946
The book covers the entire state. This is the page on Rockford.