We are heading down to Falls Park to check out the historical marker Prison Quarry!
Newspapers.com
https://www.argusleader.com/story/life/2014/10/05/looking-back-state-prison-complete/16586823/
Bulletin of the United States Bureau of Labor Statistics - Google Books
South Dakota State Penitentiary :: SD Dept. of Corrections
South Dakota State Penitentiary - Wikipedia
NPGallery Asset Detail (nps.gov)
Page 1390 History of Dakota Territory History of Dakota Territory - Google Books
1890 Biennial Report Biennial Report - Google Books
Biennial Report of the Board of Charities and Corrections, State of South D... - Google Books
What People Really Make (and Spend) Behind Bars : Planet Money : NPR
