State Historical Society of Iowa curator, Joseph W. Rich, wrote a publication in 1918 entitled "Confederate Flags in Iowa." This book documents the Confederate flags held in Iowa City at that time. The book provides good insight into the colors and condition of the flags durnig that time period.
This book was republished under the title of:
A Descriptive List of the Confederate Flags in the Possession of the State Historical Society of Iowa (1918) by Kessinger Publishing, LLC (June 13, 2009), 12 pages, ISBN:1104592061