Historical Statistics for Mineral and Material Commodities
NA Not Available 1 Also contributing to this series were Cyrus Berry Melissa Crane Thomas Goonan and John Sznopek 2 Any use of trade product or firm names in this publication is for descriptive purposes only and does not imply endorsement by the Reference Cited Mlynarski 1998 Survey methods for nonfuel minerals Geological Survey Minerals Yearbook 1998 v