Wilson Bros. Concrete Silo, Sugar Grove, Illinois. 
Inside dimensions 16x64 feet; built in 1912. 
Polk forms used. W. H. Warford, contractor. 
Second Tallest Silo in the World. Built by H. B. 
CoUom, Somerville, Ohio. Monsco forms used. 
Inside dimensions, 14x79 feet; built in 1913. 
