Sentence:  Research at Fayette , <WSD>Missouri</WSD> on oxidation ponds has shown that the BOD in the treated effluent varied from 30 to 53 mg / l with loadings from 8 to 120 lb BOD / day / acre . 
Meaning of the word marked with <WSD> tags:  a midwestern state in central United States; a border state during the American Civil War, Missouri was admitted to the Confederacy without actually seceding from the Union