Grant Wood Litho 1938 Artist Signed

I have this litho for a while now, and finally decided to put it up for sale.
Beautiful one...reminds me of my grandma.
Just wanted to share with you before it's gone... I have not appraised it and wonder if you know the value.
Woman With Plants Painting

Hand-written :

This is an Associated American Artists gelatone faximile and was created in the United States of America from the original painting by Grant Wood entitled " Woman With Plants"

Regards,