High Manganese, High Nitrogen Austenitic Steels Proceedings of Two Conferences on High Manganese Austenitic Steels: The First Conference Held in Conjunction with ASM International's Materials Week '87, Cincinnati, OH, October 10-15, 1987; the Second Conference Held in Conjunction with ASM International's Materials Week '92, Held November 2-4, 1992, in Chicago, IL