1. Maps. Gold. Value of 1928 mine production of gold, silver, copper, lead, zinc, and iron ore of United States by States and districts yielding $100,000 or more [map, with insets]; prepared by Elmer W. Pehrson and Common Metals Division from data collected by Division of Mineral Statistics. Scale 100 m.=1.3 in. Bookmark Corporate/Agency Authors: Mines Bureau and Commerce Department Publisher: Mines Bureau Date: [1930] SuDoc number: C 22.20:M 66