The Driftless Area of the Upper Mississippi. By T. C. Chamberlin and R. D. Salisbury. (A monograph accompanying the Sixth Annual Report of the Director of the United States Geological Survey.) Washington, Government. 4

1887 Science  
doi:10.1126/science.ns-10.255.306-a fatcat:yuaqir2fgjaypgcemle5meiihe