by Fred H. Kay, field work by K.D. White, Fred H. Kay, and others in cooperation with U.S. Geological Survey.State Geological Survey, University of Illinois1915.<Y995-B4456>
by Gilbert H. Cady, field work by G.H. Candy, K.O. White, and others in cooperation with U.S. Geological Survey.State Geological Survey, University of Illinois1915.<Y995-B4455>
by Arthur C. Trowbridge and Eugene Wesley Shaw ; history of development of Jo Daviess County by Bernard H. SchockelIllinois State Geological Survey, University of Illinois1916