https://www.usa.gov/copyrighted-government-workshttps://www.rawpixel.com/image/12170216Edit ImageSaveSaveEditCropCustom Text[Untitled photo, possibly related to: Examining mud from bottom of hole to determine characterisitcs of stratum through which they are drilling oil. Near Saint Louis, Oklahoma] by Russell LeeView public domain image source hereMorePublic DomainFree CCO U.S. Government image for Personal and Business useInfoView CC0 LicenseEditorial use only JPEGTIFFSmall JPEG 1200 x 846 px | 300 dpiLarge JPEG 3500 x 2467 px | 300 dpiBest Quality JPEG 4319 x 3044 px | 300 dpiTIFF 4319 x 3044 px | 300 dpi | 25.08 MBFree Download[Untitled photo, possibly related to: Examining mud from bottom of hole to determine characterisitcs of stratum through which they are drilling oil. Near Saint Louis, Oklahoma] by Russell LeeMore