TY - RPRT TI - Chemical analyses of surface waters in the Niobrara River basin, Nebraska, November 1945 to September 1949 AU - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey PY - 1951 DO - 10.3133/ofr51162 UR - https://pubs.usgs.gov/publication/ofr51162 ID - ofr51162 ER -