I found a little more information.In another book on marriage records, there was a marriage listing for Mary McGary.
Mary McGary, age 34, of Donaldson, married Peter Samuelson, of Donaldson, on 2 Oct 1890.
The parents of Mary McGary are listed as father, Michael McGary, and mother, Ellen Terry.The parents of Peter Samuelson, were listed as August and Hona Samuelson.The land that was owned in 1880 by Ellen McGary, was owned by August Samuelson in a 1908 plat book.
I also found a brief mention of Michael McGary, husband of Mary Ryan, in a Marshall Co. history book published in 1890.The mention was in a brief biography on the father of Mary Ryan.If you are interrested in information on Mary's family as well, I can give you the information on her father out of the history book. Melanie