Metalliferous black shales and related ore deposits : program and abstracts : 1988 meeting of the United States Working Group of International Geological Correlation Program Project 254 / edited by Richard I. Grauch and Joel S. Leventhal.
Imprint
Washington : Dept. of the Interior, U.S. Geological Survey : Free on application to the Books and Open-File Services Section, U.S. Geological Survey, 1989.