Paul R. Barnett A.J. Bartel J. I. Dinnin G. L. Feder T. F. Harms Claude Huffman Jr. V.J. Janzer Hugh T. Millard Jr. H.G. Neiman M. W. Skougstad J.S. Wahlberg A.T. Miesch 1976 application/pdf 10.3133/pp954A en U.S. Govt. Print. Off., Geochemical survey of Missouri; methods of sampling, laboratory analysis, and statistical reduction of data, with sections on laboratory methods reports