Supplemental material: Pre-Columbian lead pollution from Native American galena processing and land use in the midcontinental United States B.W. Bird et al. 10.1130/2019403 https://gsapubs.figshare.com/articles/journal_contribution/Supplemental_material_Pre-Columbian_lead_pollution_from_Native_American_galena_processing_and_land_use_in_the_midcontinental_United_States/12542132 GSA Data Repository Item 2019403, Geology. 2019-01-01 00:00:00 Geoscience