%0 Map %0 Microform %0 U.S. Federal Government Document %A Tooker, Edwin W., 1923-2013 %E Cannon, William F. %E Geological Survey (U.S.) %I U.S. Geological Survey %D 1980 %C Reston, Va. %G English %B U.S. Geological Survey open-file report ; %T Preliminary map of manganese provinces in the conterminous United States