Chicago Historical Society
(4)
Chicago Western Historical Co
(4)
Ravindra (Apollo Biometrics Das Inc. Chicago Illinois USA)
(4)
University of Chicago School Mathematics Project (EDT)
(4)
Chicago Sanitary District
(3)
Chicago Tribune Staff (COR)
(3)
Lind, Rebecca Ann (University of Illinois at Chicago, USA)
(3)
University of Chicago Press (COR)
(3)
Alexander (University of Illinois at Chicago Chudnovsky USA),Kalyan (The Dow Chemical Company Sehanobish USA)
(2)
Alexandru V. Grigorescu (Loyola University Chicago),Claudio J. Katz (Loyola University Chicago)
(2)
Amy B. (Loyola University Chicago Shuffelton USA)
(2)
Annika M. (Fordham University Hinze USA),Dennis R. (University of Illinois Judd Chicago USA)
(2)
Aria (University of Illinois at Chicago Razfar USA),Beverly Troiano
(2)