https://www.usa.gov/copyrighted-government-workshttps://www.rawpixel.com/image/12301971Edit ImageSaveSaveEditCropCustom TextRobert L. Hallett, Consultant on Tin, Metals and Minerals Section, Office of Production Management (OPM). Chief Chemist of National Lead Company. Sourced from the Library of Congress.View public domain image source hereMorePublic DomainFree CCO U.S. Government image for Personal and Business useInfoView CC0 LicenseEditorial use only JPEGTIFFSmall JPEG 906 x 1200 px | 300 dpiLarge JPEG 2641 x 3500 px | 300 dpiBest Quality JPEG 4262 x 5648 px | 300 dpiTIFF 4262 x 5648 px | 300 dpi | 22.98 MBFree DownloadRobert L. Hallett, Consultant on Tin, Metals and Minerals Section, Office of Production Management (OPM). Chief Chemist of National Lead Company. Sourced from the Library of Congress.More