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There is an Alexander Mossman, with spouse Therza, about the same age found in Polk, Benton, Iowa in the 1860 and 1880 census. He was born in PA, parents in PA & MD. Children include Wilbur, Byron, Hanna, Isabell, Edward, May, Robert, Harry, Emmet and Delia (born ca 1848-1872). Not sure if he is related to your Alexander or not, but some workers do have him as Alexander H Mossman......