Grain storage and the capacity for it have grown rapidly in the past 10 years, and there's much interest in the cost of the over-all operation. Here's a brief summary of the situation-nationally and here in Iowa.
Shepherd, Geoffrey S.; Richards, Allen B.; and Wilkin, John T.
"The Grain-Storage Picture,"
Iowa Farm Science: Vol. 14
, Article 3.
Available at: http://lib.dr.iastate.edu/farmscience/vol14/iss12/3