https://www.usa.gov/copyrighted-government-workshttps://www.rawpixel.com/image/12169153Edit ImageSaveSaveEditCropCustom TextOil field worker examining mud to determine characteristics of stratum through which drilling is being done, Seminole oil field, 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 848 px | 300 dpiLarge JPEG 3500 x 2472 px | 300 dpiBest Quality JPEG 4283 x 3025 px | 300 dpiTIFF 4283 x 3025 px | 300 dpi | 24.71 MBFree DownloadOil field worker examining mud to determine characteristics of stratum through which drilling is being done, Seminole oil field, Oklahoma by Russell LeeMore