Conference in the Matter of Pollution of Lake Superior and its Tributary Basin in the States of Minnesota, Wisconsin, and Michigan (2nd session : 1970 : Duluth)
Conference in the Matter of Pollution of Lake Superior and its Tributary Basin in the States of Minnesota, Wisconsin, and Michigan (2nd session : 1970 : Duluth)
Conference in the Matter of Pollution of Lake Michigan and its Tributary Basin in the States of Wisconsin, Illinois, Indiana, and Michigan (3rd session, reconvened : 1971 : Chicago)
sponsored by the Geopotential Research Mission Science Steering Group/NASA Office of Space Science and Applications, the National Geodetic Survey ... held at the University of Maryland, College Park, Maryland, October 29-31, 1984