Postcard with a bird or birds on it - This being an eagle
mailed 1907 from Chicago
Chicago National Corn Exposition 1907
Possibly signed by C Olson?? in the upper right area
shows an Eagle as if flying - with some stalks of corn (you can see some corn on the cobs exposed - as if he was flying over the sun)
Frank W Black Co
Because of the age of the cards - they are noted as being USED - no matter if they are written on or not.