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Affiliated with the Local History Network of the State Historical Society of Iowa, and the Iowa Museum Association.
Lattner served ten years as the secretary of the Dubuque Bar Association and for many years was on the board of directors of the Dubuque YOUNG MEN'S CHRISTIAN ASSOCIATION (Y.M.C.A.) He was a member and trustee of St. Luke's Methodist Episcopal Church [later ST. LUKE'S UNITED METHODIST CHURCH and president of the Worthington Savings Bank.
Goodspeed, Weston Arthur, History of Dubuque County, Iowa. Chicago: Goodspeed Historical Association, 1911, p. 747