Abstract: Papers of Theodore Albert Schroeder, the lawyer, writer, and collector of documents concerning Mormonism, whose papers reflect his deep concern for the separation between church and state. Included are personal papers and records of Schroeder's Utah law practice, 1855-1901; and a portion of his collections on Mormonism, 1841-1900. The collections on Mormonism include correspondence, the bulk of which consists of the Cobb family papers, 1841-1897, primarily concerning the liaison of Augusta Adams Cobb and Brigham Young; the Major General's Record Book, concerning Nauvoo Legion military organization and preparedness in the Great Salt Lake District, 1852-1866; George F. Gibbs' letterbook, relating to missionary activity in England by Young's secretary, 1871-1873; the Patriarchal Blessings Book, 1845-1846; notes and writings; a directory of polygamists; handwritten copies and clippings concerning Brigham Young's will, 1877-1879; and clippings, printed circulars, leaflets, notices, and petitions relating to polygamy and Utah politics.