Revision History for U.S. Geological Survey Fact Sheet 2019-3007 By Warren C. Day The Earth Mapping Resources Initiative (Earth MRI): Mapping the Nation's Critical Mineral Resources ----------------------------------------------------- Posted online February 25, 2019 ----------------------------------------------------- Revised and reposted March 7, 2019, version 1.1 The caption of figure 1 was modified by the addition of two words so that one statement reads: Mineral deposit databases: rare earth element production and resource sites in the United States (USMIN database) ----------------------------------------------------- Revised and reposted September 12, 2019, version 1.2 The URL in the contact information was replaced. The new URL links to the newly created website for the Earth Mapping Resources Initiative (Earth MRI): https://www.usgs.gov/special-topic/earthmri. To save space in the caption for figure 1, URLs for the last 3 resources were removed and the resource names were hyperlinked. The last resource (USMIN) was hyperlinked to a new address.