Revision History for Circular 1454 Bradley S. Van Gosen, Philip L. Verplanck, and Poul Emsbo Rare Earth Element Mineral Deposits in the United States ----------------------------------------------------- Posted online April 11, 2019 ----------------------------------------------------- Revised and reposted April 15, 2019 Additional paragraph of text added to the Summary section to briefly describe USGS studies in Alaska. Reference citation added: (Karl and others, 2016).